PTR 91 Field Strip (HK G3 Clone)

The PTR 91 series of rifles are essentially HK91 clones that are built here in the USA on old Portuguese tooling. The rifles are priced right and shoot well, and many people are rediscovering the joys of roller delayed blowback as a result of their being on the market. So what do the guts look like, and how do you get to them?

Big thanks to Ventura Munitions as always!
Also, check out our Patreon page if you enjoy our program, and consider helping us at TFBTV out!

Alex C.

Alex is a Senior Writer for The Firearm Blog and Director of TFBTV.


  • datimes

    Getting the bolt head into the bolt carrier is the trick you don’t show.

  • Steve Martinovich

    Prohibited firearm up here in Canada… sigh. I’d love one of these.

    • Gjert Klakeg Mulen

      “It’s dangerous because it is used by many armies in the world and you can buy parts online to make it fully automatic, which totally makes even more dangerous even though this gun is uncontrolable in full auto and is only good for suppression.”

      • Patriot068

        Ok where to get the parts?? Lol. Sucks they never mentioned the Base price

  • Riot

    “Faithful, old, classic looking gun”
    with an immaculate trigger housing

    • Rusty S.

      Considering That registered and transferable HK auto sears (especially the ones registered in all calibers) are worth more than most cars, it pays to clean them well.

      • Riot

        I’m not knocking keeping it in good nick.
        It just sticks out so much because its immaculate.

  • J

    Would love to see a G3 versus FN FAL comparison video. Two great battle rifles.

  • Yimmy

    Roller delayed like the king… right Alex? The MP5 ! Haha jk man, thanks for all you do bro!

  • Chris Hall

    Been saving up for one of these myself. Looked at the PTR 32 KFR at first in 7.62×39 but decided if I’m going to get something this heavy, the PTR 91 is the way to go. Much higher build quality than the C308s.

    • Nandor

      Plus the straight mags look better than the banana silhouette.

    • iksnilol

      PTR dropped the ball on that one. They used the same receiver and stuff as the 7.62×51 version.

      • Giolli Joker

        Could be because they have the tooling for the 7.62×51, as far as I know H&K did only prototypes in 7.62×39, and probably not in Portugal.

        • iksnilol

          That’s true.

          Though don’t they have HK 93 tooling? That’d be a closer match.

          • They do not. The HK33 rifles were not nearly as prolific as the G3.

          • iksnilol

            That’s sad.

            Maybe I should have snagged that 40 rounder when I had the chance?

  • Lance

    See why they lasted so long very simple. See why its third in the 7.62mm battle rifle ratings

    behind the FAL and M-14. Its neat same procedure can be used on the HK 33 and MP-5 as well.

    • Colin S

      By what metric are you judging them Lance? Going on length of service or production / sales then the M-14 would be last… I couldn’t begin to guess what would be first, I have to admit.

  • BattleshipGrey

    I didn’t realize that the PTR 91 wasn’t gas operated. Is it then driven by recoil and then tamed by the rollers?

    • DaveP.

      Not recoil- blowback. The same gas pressure that pushes the bullet forward down the barrel pushes the cartridge case and the bolt it’s resting on backwards, and the rollers provide a mechanical disadvantage (i.e. they slow things up) just long enough to keep the bolt closed until the bullet has left the barrel. If you want to annoy a H&K fanboy, tell ’em that their rifle operates the same way a Hi-Point does only with rollers instead of a big slide and a heavy spring.

      • Patriot068

        Wasn’t it the Germans who used rollers in their MG-34/43 design allowing 1200 rounds a minute?? I seem to have read this and saw it on the history channel, and the development of guns like the STG-44 , AK & AR-15, something about the rollers, allowing a higher rate of fire I seem to remember they used 2. Maybe I’m thinking of another machine gun

      • Hk fan boy

        Hk same as hi point…..THE AUDACITY!!!

        I say good day to you sir! GOOD DAY!

      • Actually the VP70 is straight blowback, so hi-points function like HKs.

    • gunsandrockets

      It’s a delayed-blowback action. The rollers lock the bolt head in place briefly.

  • gunsandrockets

    Alex, have you ever tried a lower-energy lower-recoil .308 load in the PTR 91? If so would you describe your impression of the PTR 91 recoil vs the PTR 91 shooting full power .308 ammo?

    My own memory of shooting a G-91 was that it kicked quite a bit more than an FAL or an M14.

  • thedonn007

    How well do these rifles suppress?

    • Some Guy

      given the high chamber pressure when the gun ‘unlocks’ probably not super well.

      though suppressed mp5s have been a thing for a long time so it can probably be done with some tweaking of the rollers.

  • Jeff Smith

    Just checking – is yelling “why won’t you go back together” at the bolt assembly part of the reassembly process? I may be doing it wrong…

    • Nandor

      The first time I took mine apart, putting the bolt back together reminded me of those medieval puzzles.

    • SineNomine

      You forgot the copious amounts of profanity.

  • Wolfgar

    I had an HK-91 back in the late 70’s. It ripped a case in half leaving the upper part stuck in the chamber. The roller lock is not my first choice for a 308 battle rifle but it was a well made rifle. Like most firearms in my past, I’m sorry I sold it. I would love to see a video replacing the rollers and head spacing. Another great video Alex,

    • nadnerbus

      They are known for rather high extraction pressure and violent extraction. I’ve never shot a roller locking weapon, but that trait would make me a little leery of buying one. I’m sure they work great with mil spec ammo, but I like my rifles to digest as many different types of ammo as possible. Easier on my bank account, and means I will be less likely to be left in the lurch looking for a specific type or manufacturer.

  • desertcelt

    Time for someone to build an American made semi auto MP44 in .223 at an affordable price. They would sell like hotcakes! PTR, Springfield, S&W, Sig Sauer, H and K erwachen!

  • Kim Roe

    I have a PTR 91 KF. I also have a SilencerCo 762 Specwar Suppressor that I have been trying to mount on my PTR. The SilencerCo 7.62mm Specwar mount and muzzle break is 5/8-24 threads steel AC591 (which I purchased from Cheaper Than Dirt). The PTR boasted its 5/8-24 threaded barrel on the web site for my model. The Specwar mount fits all of my 762 rifles with concentricity confidence. My PTR has two challenges. 1. The threads seem loose (wiggles) on the PTR barrel (more than on my other 7.62 barrels) until the adapter bottoms out. 2. The PTR barrel has extended machining to fit the OEM flash adapter that does not provide a sound barrel shoulder for a standard muzzle break to bottom out against or shim clock the mount and maintain concentricity. Is there an adapter or sleeve available to make the needed gap for barrel shoulder contact for a standard 762 flash adapter or another remedy or any advice for the PTR? Thanks