Quote:
Originally Posted by Nostinkin
Looking at what Brownells touts as Colt 901 hammer and trigger pins have 2 grooves in the pins, yet the Colt 901 hammer and trigger pins sold at Geiselle have 3 grooves.
What....? I'm confused.
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AR15 trigger pins can have 2 or 3 grooves. All the actual AR15 trigger pins I have "laying around" have 2 grooves. My 15-22s had 3 groove pins as OE.
The third groove isn't necessary on the usual AR15 trigger. The three groove pins seem to exist for trigger groups that don't use a hammer with a J spring to locate the hammer. They use a different arrangement with a spring leg on each side of the hammer. This applies to AR15s and Colt 901s.
I have Geissele pins because I got them before I found that Brownells carried 901 pins, and I got a couple sets of pins during one of their holiday sales. IIRC the Geissele pins are a slightly larger diameter for a better fit and have a better coating.
For MOST of the usual AR15 trigger groups 2 groove pins are fine.