Jul 14, 2021 · I don't have the PTR versions of those guns but I do have an HK51 built off an FMP XG3S receiver and a G3K built off an HK91 receiver. The G3K (12" barrel) variant is infinitely …

Mar 28, 2018 · I have a K3P (G3K copy); slightly longer barrel but still by PTR. I'm running into barrel shoulder and thread/bore concentricity issues, so be aware...be very thorough when …

Mar 1, 2017 · Checking your bolt gap (what they're referring to by "rollers") is independent of suppressing your PTR. With HK roller-locks, the angle of the locking piece relates to how …

Aug 25, 2016 · I called PTR and followed their recommended break in procedure; they also recommended that I use .308 ammo for the first 50 rounds as it is loaded hotter than the …

Dec 29, 2017 · Due to the barrel length difference (51 running an ~9" barrel vs. a ~18" on a 91) the receiver based cocking tube is also correspondingly shortened as well, with the 51 having …

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May 10, 2018 · Ok ill explain it, the suppressor adds to the length of the barrel. the system is timed to open at the stock length. when you add another 10+ inches to the barrel it wont have …

Apr 6, 2016 · In between form 1ing one of the ptr pistols and picking up another suppressor. I already have a 7.5" AR, and i'm curious how much louder the 51p would be with it's 8.5" …

Feb 4, 2013 · Anything mp5 should fit. At least it does on mine. I ended up ditching the mp5 forend for a 53 forend. It's a little longer and fills in the space at the back before the magwell …

Mar 1, 2015 · Quoted: Efile, wait 30 days, engrave, receive stamp, push out two pins, slide on new stock, put two pins back in. Shoot new SBR.