"Series 70 works just fine the way JMB designed it" If I had a nickle for everytime I heard that...
I really have to wonder what is wrong with the 1911 FCG design. I have never heard of a Sig, S&W Third Gen auto, Glock (quasi DAO not fair to compare but still..), H&K etc. going full auto or doubling/tripling. I know part of the problem is that people futz with 1911s more often, but people futz with Sig's too and the worst I have heard of is it going to half cock.
I'm not sure what it is with the 1911. I think it is if the sear is destroyed
enough there is nothing for the hammer to latch upon, so basically it wails
back and forth at will? And without an FP safety, im guessing there isnt
anything to stop the process either once you let go of the trigger, so the
gun would just fire until it ran out of ammo if the sear was obliterated on
one pull.
A few weeks ago the entire edge of my sear broke off in my pin gun. The
gun did not go FA... it just would get stuck at the half cock position. The
internals are set up like a series 70. No FA, but the gun wouldn't cock
anymore. So I'm not sure if perhaps that whatever was left of my sear
was enough to catch the half cock, or if something just got caught in
it.
I think in some cases quality of parts is to blame... 1911 land is loaded
with MIM stuff nowadays, and IMO, even though all MIM isnt bad, some of the parts that are out there lead one to wonder...
I've also busted a sear spring on an HK USP... basically did the same
thing... except the gun would still fire as basically a DAO... that part
of the sear spring basically pushed on the single action hammer catch....
strange thing.
-Mike