The receiver tube is actually the recoil buffer assembly.
I've had a stocked 51 and it was more than a little muzzle blast. A 51 handgun will probably be quite the wrist snapper. Just an FYI if you decide to SBR it, you cannot used a standard buttstock / recoil rod assembly. It will fit, but it won't function. The recoil spring and buffer assembly must be modified to work on a 51.
Not sure if the screw holes have been filled, but you can take your existing stock collar / recoil assembly and attach the plastic stock to it if it hasn't been modified. That is after you register it as a SBR of course.
51s are fun but can be finicky which is why HK never went into production with them.
I don't think any of the folding stock options would actually work, you could modify a retractable stock but that would be pretty punishing as they are pretty much a meat tenderizer on a full size G3 rifle.
Last edited by SteyrAUG; 03-27-18 at 15:38.
It's hard to be a ACLU hating, philosophically Libertarian, socially liberal, fiscally conservative, scientifically grounded, agnostic, porn admiring gun owner who believes in self determination.
Chuck, we miss ya man.
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