This is a gun that is not as easy to use as an air driven one and does take some getting used to, I think that is where people have problems. Good balance and power and does not take the expensive, more limited Paslode round modified nails and will take up to a 3 1/2", 3 1/4" is not code in some areas and that is as long as the Paslode IMCT will shoot. I like not having to but anothe set od nailer for this gun as the Std. Senco style .
br /The fuel rod has to be in place correctly or the gun will not work correctly, sometimes you have to reinsert it if it does not seat the first time before closing the cover. There is a lock out on the nail strip to prevent dry fire so you need at least a 10 nail strip to start. You can not bump fire like so many like to do, wildly place nails all over, it is a sequential fire so you must place the nose on contact then let the fan start and fire,rated 2-3 nail/sec.. It takes some experience to learn how to use it. Go for an air driven nailer if you want to shoot it like a machine gun and have nails thru sheathing into air space like is the case in so many homes. I know bump fire can be done correctly but more often than not I see careless building results.
br / I have a Paslode finish nailer and it works fine, has its issues too, especially in having to be kept clean and use specific products for maintience as this gun has too.
br /The rubber grip on this tool and the balance is very good, hold the Paslode too you will see how much better this is. This is Made in Japan and not a cheaply made tool as so many tools are today. The fuel rod is from Germany, and does not have an expiration date like the Paslode fuel which will work too[Red rod]. They did have problems with the early Hitachi fuel but that is corrected now.
br /I do not like the depth adjuster and jam removal screws because you need a 5mm allen key that is supplied but does not have any onboard storage [it does have a spot in the nice case]. The depth adjuster should be tooless, I really dislike those 2 issues . There is also no rubber protector boot for siding or decking but again the Pasload boot will fit if you buy it. For the price it is a great tool IF you follow instructions and do not have expectations that it will act like an air framing nailer. I hope Hitachi will decide to make some finish nailers too.

I have always been a fan of the cordless nailers, I have two each of all of the Paslode guns. You can frame and finish a whole house w/ a gas framer, finish, and brad gun. I added the Hitachi Round Head to the mix just to have more flexibility in nails; if I run out and the closest supplier has one or the other styles I'll be covered both ways.
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br /The comparison: I think the Hitachi has a better balance point in your hand. The Paslode is, I think, heavier in the nose, and so feels heavier. I like the Hitachi battery set-up better. If you get a piece of debris jammed in the Paslode along with the battery, it can be a bear to get out. The Hitachi is also easier to adjust depth of drive, although once you have it set, you rarely have to change it, unless you go from wood to microlams and back.
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br /As far as the basic nailing, both guns perform the same. As other reviewers have noted, one down side to the gas nailers is that they require more pushing force to activate (so you can't use it as a gun like Danny Glover did in Lethal Weapon!). So if you have aligned two work pieces and are trying to nail them, you have a tendency to move the work when trying to activate the nailer. You also have to be careful not to leave the gun lying around with the battery in; it will run down.
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br /The one performance issue on these guns is in extreme cold weather, especially if you are trying to nail over your head with the gun upside down. They won't fire. In those conditions, I kepp one gas canister in my pocket where it keeps warm, and I switch them when the one in the gun gets too cold. Note that in these conditions, you are also likely to have problems with your compressor, so the one is no worse than the other. Also, note that a pneumatic stick nailer probably holds 3-4x as many nails as either gas nailer, so you do have to lug around a lot of nails, and reload frequently.
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br /All in all, I don't understand why I don't see these on every job site. Who wants to drag a hose through the truss webs if you don't have to. You can just hook this baby on your tool belt and climb around freely. And for the DIYer, I would highly recommend it. No compressor needed!

I had hoped this would be a great tool for small projects, but it turned out to be a great disappointment. I was able to drive 8 (eight) nails in standard 2x4x8 after which the tool stopped working.
br /With a fully charged battery I thought the fuel cell might have been from a bad stock, so I replaced it, but with the same result. Being optimistic, I bought a new set of Hitachi fuel cells, but that didn't change anything.
br /I have followed the procedures outlined in the Troubleshooting section of the Manual but the tool refuses to work.
br /I have been using power, and pneumatic tools for a long time, but this one got me :(
br /Probably Hitachi should revise their testing procedure, at least for this tool, to ensure its reliability.
br /I hope Amazon will accept a return for the nailer, but I ended up with a box of nails and two sets of fuel cells for a total of almost $100 lost money!!!
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When it works, this tool is a jewel; powerful, easy to handle, and it drives a true round-head nail. It's just that it doesn't work very long. The original unit acquired via Amazon lasted for somewhere in the neighborhood of a hundred nails, and then died. The local Hitachi dealer's service department could not revive it, so it was replaced with a new tool. The replacement lasted somewhat longer (200 hundred nails, perhaps) before it too ceased to fire.
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br /The problem seems to be a flaw in the triggering mechanism that shows up after relatively moderate use. The dealer's service shop tried to repair the tool, and it worked for a dozen nails or so and then quit again. The dealer has been trying to get Hitachi to once again replace the gun, but the Hitachi rep. has apparently been unrepsponsive. In any event, unless the flaw is fixed at the factory, simply getting a new gun is no solution.
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br /If my experience is anything to go by, purchasers of this Hitachi tool may be doubly cursed, first by a poor product design, and thereafter by poor customer service. My suggestion is to buy something else(which it looks like I'm going to have to do).

We have three of these guns on our jobsite, and so far its three strikes against this gun. Two of them have (exploded) and broken in half, and one has multiple parts broken. I dislike the difficulty in actually using this gun above your head or in a position where you can't use both hands to press the gun down HARD enough to activate it. It has a very small magazine and trigger pull is atrociously hard. I would not buy one of these guns for my own use, it needs a lot of improvement. It is great not to have to drag a hose around but its still not worth it yet with this gun.

I've only had the nailer about a week, and haven't used it alot other than just trying it out- 'bout 1 strip of nails. So far it seems to work pretty good. It hits really hard and is well balanced. Not too much heavier than an air nailer. The cons: really could use a tooless depth adjustment. You really have to push hard with the nose to fire a nail. Cleaning instructions and maintenance are not in the users manual, you have to go to Hitachi's website and download a pdf file for the instructions and recommended schedule. It doesn't have a bump fire feature so you won't be firing nails as fast as a pnuematic gun.

Purchase experience from Amazon - 4.
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br /I have put five strips of Hitachi 3x.120 ring shank HDG nails through my new NR90GR. I liken the experience to a Pretty woman___who is celibate. It looks good, feels good but doesn't satisfy.
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br /I was nailing standard pine 2x4's together and without fail every nail was left standing a half inch or more. I had to finish the task by hand. The depth was set to max penetration and I tried different new fuel sticks. I am in Miami so temp and elevation is not a factor.
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br /I have left email with Hitachi support, still waiting a reply. If they offer meaning full help, I'll follow up this review.

I've used the Paslode cordless framing nailer before this works the same as the Paslode. I was sceptical that it wouldn't live up to the "king" after reading the reviews, but I did lots of research on this product and just after 2 weekends of carpentry work, it works the same as the Paslode. The biggest difference is price. The Hitachi cost me about 60% of the Paslode's price from Lowe's and Home Depot. It takes the Paslode nails and red fuel cells, works the same, and slightly lighter weight. I strongly recommend it!
br /Bob

I did a lot of research on line in my quest for a framing nailer. Since my projects were inside the house where it would be used I thought a cordless would be the best choice. The Hitachi looks like it could sink nails from hell and I couldn't wait to try out the new toy. I followed all the instruction on the preparations before use and read all the safety precautions. My first use of the nail gun was to test fire some nails to make sure the depth was set properly. Three out of six nails went into the scrape 2" x 6" at the right depth. I figured the three that didn't go in was from operator error. Well, off to the project, which was to build two interior walls out of 2" x 4" materials. The first wall was 8' x 10' and it took almost 4 hours to build between cutting material and trying to get the nail gun to fire. In four hours I shot 30 nails and half of them never went in the full depth. So I went to the trouble shooting guide and followed the check list. Nothing improved after charging the battery again and inserting a fresh gas cartridge. On page 13 of the instruction and safety guide, right hand column, last paragraph, it says " not recommended for use above 5,000 feet...". Well guess what, Albuquerque, New Mexico is above 5.000 feet. So the next morning I went to Lowes and talked to a tool customer service representative and told him my problem. He said that "Paslode had to come up with High Altitude gas cartridge to make their guns fire correctly." So hopefully with enough complaints Hitachi will do the same. I ended up buying another Hitachi framing nailer that runs off compressed air. It works great. I finished the second wall in two hours. Somewhere in the product description on Amazon/Hitachi web site they need to put that statement about use above 5,000 feet to let a potential customer know what may happen. If I would have known prior to making my purchase that it wouldn't work very well that I would have purchased the air model instead, the first time out. I must say that Amazon did refund my money in full to include the shipping and handling without any hassles. That part worked just fine!

This gun has several advantages over the paslode. You can use any strip nails that you can use in any other gun. And it fires better than the competition. And it has plenty of power. I like it.

I don't know what people's problems are but I'm fully satisfied with the purchase. I was on the fence which gun I should buy (I had had some experience with the Paslode framer and finisher), and I took a risk and bought the Hitachi. Then a friend of mine lent me the Paslode, and I compared both on identical pieces of wood and identical method of nailing (face, toe-nail). There is no difference at all! Both drive nails at the same depth. Probably, people don't use appropriate nails for the Hitachi, and they have problems with misfiring and the depth of driven nails. Make sure you use plastic collated for NR90GR or paper collated for the clipped head type as it is indicated in the manual (I used hitachi nails 3-1/4" long). It works perfect on Paslode fuel cell, so there is no need to look for Hitachi cells. The Hitachi has a few advantages over the Paslode.
br /1)The battery charges up much quicker and the mounting system seems to work better (I worked with the Paslode finish gun and there was perpetual problem with battery connection).
br /2)The ergonomics is uncomparable to the Paslode. The Hitachi seems to be made to your hand.
br /Looking at all these characteristics I don't see the need to buy a more expensive tool when a $100 cheaper one makes the same job and actually is better.

This gun gave me a lot of headaches...it would fire a few nails, then nothing. I would take out the gas canister, press it manually a few times, then reinsert it. The gun would shoot well for a while, then nothing again. I found that the problem was with the Hitachi brand gas. For some reason the gas metering valve would stick or clog, and not supply enough gas for each shot. The solution? Red canister Paslode gas. I so far have gone thorough 3 of them with no hiccups from full to empty canister. This thing is a great tool, no regrets as long as I use Paslode gas.

No complaints! I recently helped a friend tear down and rebuild a 8 x 16 mudroom on his house. We pre-built the walls in his garage with the nailer and put it up in a short amount of time. I've used a Paslode nailer before and this nailer seems lighter and better balanced. I've shot about 1500 3 1/4 and 2 3/8 nails and I switched out my first fuel cell acouple hundred nails ago. Only problem I have is finding Hitachi fuel cells in my area. I ended having to order them on-line. A great gun at a great price!

I'm rehabbing a mobile home and bought the Hitachi cordless nailer along with the reconditioned Milwaukee V28 combo (circular saw, reciprocating saw, hammer drill). While the Milwaukee combo worked terrific right out of the box, I came very close to returning the Hitachi.
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br /This really surprised me because the Hitachi compressed air nailer is the nailer of choice of framers I know out in California. Hitachi positioned this cordless nailer as a step up from the Paslode cordless nailer and I expected a terrific tool. Instead I got repeated no-fires, a blister at the base of my thumb and very frustrated. Ultimately I changed the gas cartridge as a last resort and life became at least pretty good. Apparently my first gas cartridge was defective right out of the package.
br /So, despite the claim of a "dry fire lockout" I had beaucoup problems.
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br /Please note also that as of this writing, Amazon still does not carry the gas cartridge. You'll have to order that from someone else. This is an inconvenience and I would far prefer Amazon to support the tools sold with the accessories we need to use them. I also feel ambivalent about the Eagle nails. They work, though.
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br /There remains an inconsistency with the depth setting. On the same board, one nail will go in an 1/8, the next ends up flush, and then a third will end up 1/8 above and I have to whack it with a hammer. So in some ways the jury is still out on this tool. I have much more work to do with it and may follow up later on. So far, I am glad I bought this only because it PROMISES to make work under the mobile floor much less troublesome than with a hosed tool and the initial frustration with dry-fires has been resolved for now.

I've been a framing contractor in Ca for over 18 years and I have never been dissappointed with Hitachi. It's notorious for great, dependable products. Not so with the NR90GR nailer. Terrible! The gun had been a bust right out of the box. It didn't even get through one strip of nails. It just won't shoot. If you have the skills and the timing of a jungle cat that's been trained by a ninja, you might get it to fire! I thought this was going to be a sweet little tool that could save me a lot of time on the job. I was wrong and as a consequence very dissappointed. I've replaced the gas rod multiple times, I've charged the battery, I've taken it to a tool repair twice, and it still doesn't work. I'm sticking to the hoses until Hitachi comes out with a new and improved model.

This is my first nail gun ever.
br /I am not a "wood lover" (for building structure), and buildings I make are out of concrete, brick+mortar and steel. I am not a carpenter and I can not stand working with 2x4 what is actually 1.5x3.5" - but not precisely (it is sometimes 1 7/16" x 3 7/16" what makes me crazy). I have a machine shop and make high tech products, so miss-tolerances, I just simply cant tolerate.
br /Said all this, I was afraid what I am going to get from this gun, how I am going to perform with it, and is the idea of having a nail gun (opposite to regular hammer) really worth all the hassle, learning curve and other troubles on the way. Not to mention, hose-less, and some really negative comments about this product and the whole portable idea.
br /Not only that this gun is precise tool, but anybody can operate it. Perfectly balanced in your hand, no kick back (even with 16d nails) fast operation. Somebody who commented that this gun as a hard to press/engage is either really weak (my wife used it with no problem) or have malicious intentions towards Hitachi. Safety pressure is just enough to warn you and ask you for correct position.
br /For some people is not enough of nails in the gun (1.5 line max) but that is not an issue for me. Changing/feeding new ones is a snap.
br /As I said, it is really precise tool, didn't stop working not a single time, fired every nail perfectly where I wanted.
br /We framed a roof (what I never did before) in a snap. Big hook (collapsible) is square shaped - to fit over 2x4, is perfect helper to rest the gun on the truss. Not having the hose to pull you down on the top of OSB on the roof, HUGE advantage.
br /I have to say that the carrying case is perfectly organized, for 2 fuel cells, battery+ charger and some 7-8 rows of nails to carry around. Sturdy plastic case is worth the money alone!
br /My friend, who is wood worker for a living and told me about portable nail guns, helped us with the sheeting. He never had hose-less one before, million of "normal" ones, and was just impressed with this Hitachi.
br /He is getting one from me as a present, for the help, but even more for the favor he told me about them.
br /As always, Amazon had the best possible price, no shipping charge, and it came in the snap.

I purchased this nail gun for a roofing job that required a total reframe of the sagged structure. I was excited to avoid the hoses all over the place and the sound of the compressor over my stereo.
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br /The description says it shoots 3 1/2" nails. It does shoot them, but only 20% actually go in all the way. The depth adjustment was as deep as possible and I tried everything to get the nail to fully lodge into the new lumber. I ended up having to go back over the entire structure with my framing hammer and spend 30-45 minutes setting all the nails.
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br /When the framing was complete, I thought I'd be home free with the sheeting nails at 2 3/8". The gun misfired and misfired and misfired some more despite changing nail types (I bought nails at Home Depot AND the ones on the Amazon detail page with no difference). After the gun stopped firing completely, I quit and hand nailed the rest of the sheething.
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br /The reality with this gun is that a good framer can hand nail faster than this gun can shoot nails. Between not sinking the all the way and misfiring, the tool is more trouble than it's worth. I returned it and purchased a basic Dewalt pnuematic framer and have had much better success.
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br /I wouldn't recommend this gun to anyone unless you enjoy frustration, slow results, and the constant desire to throw this tool across the parking lot.

I had some problems with this until I started using the Red Paslode Fuel Cells. The Hitchi ones wouldn't work at 6200'. Not having an air hose is great. The rafter hook is very useful. I bought a reconditioned one and am very happy with it. Don't let the negative reviews scare you, once I started using the Paslode Fuel Cells it worked fine.

br /This Hitachi gas framing nailer is worthless.
br / It says it will drive a 3.5" nail all the way in but even threw soft wood it leaves the nail stick out half an inch. so I bought 3" nails and it sinks them all the way.
br / The gun doesn't shoot any nail about 1 out of five times. I can hear the gas chamber's fan turn on but no nail comes out. I tried a new battery and new gas cartridges all to no avail.
br / I am building a barn and will be walking around in rafters. I can't have a tool that sometimes works.
br / DO NOT BUY THIS piece of junk. I had a paslode before and it worked fine.
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I've had this unit for 2 weeks now, doing some roof and wall framing. Granted, it doesn't bump fire like an air nailer, but that's not a requirement for me as I'm a methodical type, so an extra 10-seconds to nail off a row of studs is not an issue. The gun works well, is plenty powerful, the 3-1/2 inch ring shank limitation is known, so I work within its capabilities. I find you have to teach yourself the right amount of pressure it takes to enable firing, and I don't give it a second thought now. VERY pleased with the convenience of no hose and 40-lb compressor to lug upstairs.

I was able to drive about 250 nails with the first 2 fuel rods I purchased ($14.50 for the pair). Nice to see that it will supposedly fire Passload Red rods. I will try that - but after 2 weeks of moderate use on a current project, I am always surprised when it decides it will shoot.

I was hoping to see a fix for this somewhere - the manual does not even address this apparently pervasive issue. By now there should be some advise from the experience directly from Hitachi?