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Old July 10, 2010, 10:39 PM   #9
James K
Join Date: March 17, 1999
Posts: 24,160
IIRC, that breechblock is supported by two big lugs that fit into the top of the slide, a bit like the barrel locking lugs on a M1911 type pistol. The welding is just to keep the breechblock in place; the lugs, not the weld, support it against the cartridge pressure.

I checked the front straight "crack" (the line ahead of the weld area) in my pistol and as best I can tell under pretty high magnification, it is not a crack but a mark from the seam of a forging die. The crack in the weld itself is a crack, but of little concern.

Jim K

Last edited by James K; July 10, 2010 at 10:45 PM.
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