if you could find some sort of 3 lug attachment that actually rotates onto the lugs to lock. then blind pin in a way that prevents unlock rotation, rather than pinning into the actual lug, there would be no permanent holes drilled into the lug/host, and it should meet the requirement for being permanent.
I am not a lawyer, so the 'should meet the requirement' should not be taken as a good to go.
if I remember right, the length that a k gun barrel has to be extended to remain legal for the OAL requirement is 19"
Last edited by fullmann; 03-07-2012 at 10:22 AM.
The mp5k extension that jayson sells (~80$) is roughly 11.5" long so that brings the barrel length up to 16". But about being the minimum required length OAL I'm not sure. If you put one of those fixed stock adapters that would work. But if it is a folding stock and you measure from the folded position (or just back plate) then it would bring you to about 24", so I think no go.
Why are you measuring from folded? OAL for SBR determination is done from extended, with the exception of some states, like CA, yes?
Buy two extensions. Then, cut and weld them to the proper length. Doesn't seem that difficult. Probably going to look pretty ugly.