Yes, get the same locking piece as you have now if your rifle functions correctly with the ammo you use. I've never personally seen a trigger or hammer spring break, and I've taken apart HKs that have had 50k+ rounds through them in FA, but it's always good to have spare springs as stuff does wear. On the extractor spring, make sure you get the silver colored rifle ones and not the brass colored submachinegun ones.
Post Gillie operation (new locking piece, and new barrel):
.019 bolt gap holding firm
And of course had to add a paddle mag release:
The man is an artist.
Finished off in what was supposedly expired Duracoat (hey, I'm cheap, and it is holding up the same as the AK's I finished with it when it was new) and it is slick as snot.
Bought a HK33 kit w/new US barrel from APEX, used what I needed, sold off the rest of the kit and the Century barrel. Total parts cost $80. Can't beat that. Only regret is not buying a 33K barrel and flashhider rather than the 16" barrel that came with the kit.
The receiver was a Hesse, so it took some milling to get the paddle mag installed, but overall it is my favorite rifle. Runs like a top.
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