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Old December 7, 2021, 03:41 PM   #10
MarkCO
Senior Member
 
Join Date: October 21, 1998
Location: Colorado, USA
Posts: 3,635
Stock triggers, as 44 AMP correctly explained, don't need them. Cassette or cartridge triggers benefit from anti-walk so the pins don't fall out as there is no retainer in the cassette. Anti-rotation pins became a thing for lightweight carriers with a higher velocity where some set-ups would, over time, enlarge the holes making them looser. But, if you had anti-walk, it would be a LOT of rounds before there was an issue.

Then came PCCs, with much higher forces on the hammer and thus transferred through to the pins. Some have egged out the front pin resulting in malfunctions. The anti-rotation pins that are locked together transfer some of that force to the rear pin mitigating the wear of the front pin hole. I won't run non-connected pins in a PCC.
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