Quoted: A pre-series 80, if it lands muzzle down from about waist high can go off, especially if the ammo has soft primers.
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With an in spec firing pin spring, it takes more than that. Plus, adding a extra tension FP spring takes the safety factor even father (read you dam near have to throw it muzzle down to have the FP have enough force to ignite the primer. Fact is then only time I have had an AD by inserting a round in the chamber and letting the slide slam forward was when I was using an 18 LB recoil spring, and forgot to change the stock FP spring to the stronger Wolff FP spring.
I have 5 Colts and only 1 is a pre-80. I cannot tell the difference myself.
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Series 80 requires trigger creep/movement to activate the FP cam/block. Series 70 does not require this creep, and if you can't feel the differences, the triggers (FCGs) on the 70's needs some attention to remove the unneeded creep, and may even after travel.
Simple put, the trigger on a non-FP block 1911 only needs to travel around 1/8" to release the sear off the hammer, then back forward to reset the disconnector. The 80 on the other hand, needs dam near 1/2" of trigger travel to active the cam/FP block.