Match Grade Trigger

[forty_caliber]

I'm looking at putting a high quality quality trigger in my new AR.  I've been shopping around and found a pretty good selection over at http://www.primaryarms.com/MCategories+AR-15-Triggers.

Some of them are designated "small pin" and others are not.  How do I tell which one to get for my particular lower?

.40

[jtallen83]

21 minutes ago, forty_caliber said:

I'm looking at putting a high quality quality trigger in my new AR.  I've been shopping around and found a pretty good selection over at http://www.primaryarms.com/MCategories+AR-15-Triggers.

Some of them are designated "small pin" and others are not.  How do I tell which one to get for my particular lower?

.40

Most everything is small pin now days. An older Colt may be large pin. A good read on the topic;

https://geissele.com/colt-rifle-users-guide/