I did it.
I should also say that I fixed that "A3 dip" shortly after this pic was taken by building up the internal diameter of the stock cap with JB weld and then simply mortaring the stock.
It's super solid now, and much easier than all the crazy pinching methods I was hearing about on TOS.
(though I know it will come back a little bit with use)
Also worth noting is that the value of these went THROUGH THE ROOF as soon as this letter dropped:
http://www.hkpro.com/forum/hk-clone-...sear-host.html
I'm casually in the market for a sear now...