Do you have any info regarding how can I purchase and install a match grade barrel at a HK G3?
Can I make any modifications by myself IOT make the existing one a free floating?
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Another poor soul sucked into the roller-lock whirlwind lost and never to been heard from again, eh?!?!
Purchase...yes. Adam Webber/HKParts.net usually have inventory of quality match barrels for both MSG-90/90A1 and PSG-1 clone rifle builds, including LW, Schneider, Douglas, etc. Depending on mfg, a match barrel for an HK91 will run you $750+ up to ~$1k for JUST THE BARREL (noth the accompanying PSG/MSG style trunnion which you really will need to run to get the most accuracy out of any match barrel on an HK91 style rifle).
Install yourself...NO! I see people all the time professing that they can do and have done barrel swaps (match or otherwise) on their HK91/PTR91 rifles using some of the most bizarre tooling, including hub pullers and impact wrenches to accomplish the job!! NUTS!!! JUST PLAIN NUTS!!! By way of example...let me just walk you through some of what's required just to properly remove the existing barrel from your rifle. First, you have a cross pin that goes through the barrel extension that must first be removed. That pin is swagged in place. You must remove the swage from one side and then drive out the pin. An end mill cutter in a millng machine is usually the only way to go for that job unless you really want to @#$% stuff up or have a mess on your hands. Once the pin is out, you'll have to jig the receiver in a press (oh...you'll need the jig by the way
), and using bronze rods, drive the barrel forward out of the extension. For that, you'll need a fairly heavy-duty hydraulic press. I won't go through every last detail on removing/reinstalling a barrel in an HK91 style rifle as that info is usually enough to scare off the basement gunsmith.
Do yourself a HUGE favor and head over to HKPro and have a good, long, hard read through more information than you could ever want or need about doing what it is you propose to do. Or, if you'd rather read here, have a look at some of the lengthy info I've posted on "accurizing" or otherwise working on HK roller-lock pattern rifles/carbines. It isn't even close to worth your time or your money...PERIOD! You can spend thousands of dollars and at best, on a good day, still end up with a ~1MOA shooter short of going all-out with something like an IGF/RDTS/etc. PSG-1 or MSG-90A1 clone.
The "free-floating" is essentially the same story, but you should know that the later model G3 and the HK91 rifles are technically considered to have "free-floating barrels" because there is a very small gap (1-2mm...I know) between the cocking tube and the tripleframe. Because the forend/hanguard attaches to the cocking tube and technically, in a perfect world, doesn't touch the barrel, its considered free-floating. If you want "more" free-floating, then you'll have to do a conversion like an MSG-90/PSG-1 which uses a considerably different mounting setup (trunnion, cocking tube, and a specialty handguard itself). Just in parts alone for the barrel swap and handguard/trunnion/cocking tube/etc. conversion, you can quickly and easily get yourself into the ~$2k range without batting an eye.
Simply put, if you want an accurate, reliable, semi-auto .308 (or similar class) rifle, start with any number of different AR-platforms and skip the HK, leaving it well enough alone as an outstanding, reliable, M.O.M.-capable battle rifle. They are holes in the gunsafe that you throw money into and never see results that can otherwise be obtained for a mere fraction of the cost, headache, time, etc. and built in your basement with a minimum of tools/expense (i.e. - any large-frame AR). You can get a factory fresh sub-MOA shooter with a large-frame AR for ~$1800 or less ready to go (minus optics/mount/etc.) or you can build and have it done your way with precisely the parts/etc. you want right out of the gate.
Ok...sorry...I'm done being a downer today.
Good luck and God speed!