I have tried to find out the details on the Large & Small Trigger / Hammer pin situation and I can't find anything on the subject anywhere.
Can someone please illuminate me as to the particulars, IE... What is the typical size, what is the Colt issue (I know they made both sizes) is there a chart somewhere that lays out what is what???
Colt made two sizes.....small pin 0.155 and large pin 0.170
Generally pre 90 commercial Colt rifles were small pin,newer commercial ar's were large pin.
I have Colt 66,76,78 annd 80 Ar's that are small pin,
Have Colt 90 ,92,95,03,05 AR's...they are all large pin.
None of my Sp1 or Sporters are large pin.
All these pins in both sizes are available from www.specializedarament.com
In www.BROWNELLS.com catalog
even DPMS makes parts to fit the large hole COLT hammer, trigger .