Is this reparable?
 

I picked up what appears to be a nice example of a P08 but for one seemingly small problem. I have no clue as to how the PO managed to break this tiny piece off but he did. Can this matching numbered part be repaired or not?
Any advise is well received!

Welcome to the board.

I doubt the PO broke it, it looks like it was worn through from the tab on the striker spring guide.
Sometimes they can chip, but this one looks just worn.

It can be fixed, either by welding and re-milling or other means- though I don't know anyone who undertakes this repair as a vocation.

I recently repaired a similarly worn breech block of mine by inserting a pin from side to side and re-shaping it a little.

I've been meaning to post the process, just have not gotten around to it. I'll move it up on the "to do" list. ;)

http://forum.lugerforum.com/showthread.php?t=35951

Done! ;)

These can be repaired through micro-welding and machining, but it's costly.

It probably happened with a pierced primer or something that lead to over pressure. Is the firing pin fluted? Relieving pressure was a primary reason for adding flutes to the firing pin at Mauser.

Welcome to the forum, Miliam...

Virtually anything is "repairable", providing one can shovel enough money at the problem to have it properly done. The technology of micro-welding comes to mind, and I think there is a forum member with either the capability or a good contact for someone who can. Building up the broken area again with TIG welding may also work, if dimensions are cleaned up by machine or hand work after.

This general area of the a Luger is susceptible to damage when using too powerful a load, which may well have happened. The action bottoms out on itself and the frame, stressing and hammering everything. There is an established rumor that Lugers like heavy loads, but this could not be more incorrect! No +p, +p+, or anything marked NATO! Shoot 115 or 124 gr standard loads, Winchester White Box is the go-to round.

I'm not an expert but I don't think it's worth reparing it.

The cost of repair would only be justifable on a collector grade, matching PO8 to keep it match, when you can purchase a new repro breech block for around $100. TH