I just started the paper work and hope to get it in October. I want to put a 53 top on it, what has to be done to make it function? My first HK. Is it like an AR put the lower on and go?
With a registered receiver there is no swapping uppers... the upper is the registered part. So you use it as-is, there is no easy do-at home caliber/configuration swapping that can be done with a registered receiver other than changing the buttstock/forearm.I have a registered receiver...
It seems like it would be a whole lot easier to build a 53 on a new receiver from a cut down kit, but I'm sure one of the good builders on here could convert it to 53 length without destroying the registered receiver. It would involve cutting out the current cocking tube and re-welding a shorter one in addition to the barrel installation. Might do a bit of research on suppressors and 53-length barrels though. From what i've read, most suppressor manufacturers don't recommend it because of the sub 10" barrel length. Something about muzzle blast destroying the internals...