AR trigger pin size...

[SabreKiller]

I have a Bushmaster M4. How do I know if the trigger is small or large pin? I’m looking to replace the trigger. Thanks

[Flint knapper]

I believe the only big pens are on the older colt models, or at least that is what I've been told!

[Outbreaker]

I believe the only big pens are on the older colt models, or at least that is what I've been told!

this.

[rosco11]

It's small pin

[SabreKiller]

Thanks. I just ordered a CMC trigger for mine. Midway had them on sale and I can’t stand this factory trigger.