The sigs that have a DA hammer lock when the hammer is down. The hammer doesnt touch the firing pin therefore you cant just "Drop" your gun and have it fire.
I have a sig p226 combat and LOVE IT. I also have the mbus and I read a review that they are basically indestructible. I'll check to see if I can find that review for you.
Edit: Found it: http://kitup.military.com/2012/07/ba...drop-test.html





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