M&P 15 trigger pin size?

[overkill556x45]

I'm looking at a RRA 2 stage trigger for my M&P15. Anyone know what size the trigger pins are (large or small will suffice, since this is how RRA lists their parts)?

Sorry if this is a re-post. I tried the search tool here at TFL, google, S&W's website, RRA's website, etc.

I would check myself, but I'm living at college right now and my calipers and M&P are back home safely tucked away.

 

[Bitmap]

I'm pretty sure Colt is the only company that ever made large pin lowers.

Give S&W a call. I'm sure they will help. If not, call Brownells. They have gunsmiths available to answer questions.

 

[Alleykat]

Small.

 

[Ballenxj]

Small

Even the second gen or latest M&P 15's?

 

[Theohazard]

Small

Even the second gen or latest M&P 15's?

Yes. Only Colt made rifles with large trigger pins. If you don't have a Colt, it's definitely small pin. If you do have a Colt, it could be either depending on when it was made.

This is from Geissele's website:

"Colt is the only AR-15 rifle manufacturer to use both small and large diameter pins in their trigger groups. Most Colt AR-15 rifles manufactured before 1991 and after fall 2009 are probably small pins while rifles manufactured between 1991 and fall 2009 are probably large pins. [...] If your rifle is not a Colt, it uses small pins exclusively." (Emphasis mine)

 

[Ballenxj]

@ Theohazard, thanks for your quick reply.
Mine is a Smith & Wesson M&P 15, although I also have a very early Colt too, so useful information all around.