OK, here we go...
Slide fractures. 6 in the field about 12 in T&E, 18 total, none since 91. 4 w the SEALs, 2 w the Army, the rest in lab T&E.
It was a combo of bad ammo and bad weapon maintenance. Early mil-spec ammo had some stuff way over pressure (over 50K psi! +P+ is 38K, NATO up to 40K or so.) and the SEALs were playing w 158 handloads that were waaaay hot too. Kept breaking blocks, kept on shooting, duh! OTOH, the lab T&E guns shot the normal mil-spec stuff, and some of then broke as low as 2K rounds, but a lot of that was over pressure stuff(the army was measuring pressure at the muzzle, not the chamber? duh again!)
IF the locking block fails, and IF you continue to fire the gun, the slide will fracture. Don't fire it a lot w a broken block, and you should be OK. You will know the block is broke cuzz the gun will start to jam a lot; replace it within the next 500 rounds and you are OK.
If you think you have damaged/cracked the slide do the "bell check". Hang the slide from your finger by the fwd part that the guide rod slides into and tap the slide with the guide rod; if it rings like a bell or hums like a tuning fork its OK; if it goes clunk, it is cracked somewhere (does not apply to other guns BTW). Quick, easy, works as well as expensive magna-fluxing.
The 92Fs has an oversize hammer pin that acts to retain the slide should it fail.
In latest mil-spec T&E the M9s are avging 20K for locking blocks, 35K for frames, 55K for slides, 55-75K for barrels with mil-spec ammo, same as +P+. With std pressure stuff they go a lot more; know of many that have over 100K through them, and plenty of blocks that have gone over 50K. Blocks and barrel lugs were strenghtened again in 93.
Since the probs in the late 80s, the military has bought over 100K more M9s and the French police and military (along w others) switched to them; I guess they think they are OK now?
NYPDs EST says they broke a lot of blocks, but LAPD/LASO don't have that problem. YMMV?
It's at least as tough as any other alloy framed auto out there, and I would say a tad tougher than the SIG (I have lots of experience w both the M9/M11 BTW). It's not 1911, Glock, or USP tough, but more than tough enough enough? If ya need more, buy two.
Much ado about nothing, don't worry about it.
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[This message has been edited by BrokenArrow (edited July 16, 1999).]