I just bought a semi auto bren MKI conversion by Stemple, and everything seems to be in order except for the firing pin and bolt block. The pin is completely immobile, and no amount of oil or hopps solvent seems to loosen it. Based on how sticky the retaining pin in the block was, I assume grease and grime has completely stuck the pin and spring in it's captive spot. I am taking it to a gunsmith on Monday to see if it can be removed and still used, but if it can't, where can I buy replacement semi auto parts? I've looked at firingpins.com, wiselite, sarco, and pretty much everywhere else I know of that used to have such items, but nothing is available.
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