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Old 07-05-2017, 06:36 PM
tomcatt51 tomcatt51 is offline
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Location: never never land, USA
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I agree about bad advice being given. This should maybe be in its' own thread but needs mentioning...

Our 15-22s use a generic "small pin" AR-15 trigger group. The "small pin" trigger and hammer pins are nominally .154" and .900" long. The pins that came in my 15-22s measure .1537" - .1538".

I use Geissele AR-15 trigger groups with Geisseles' 901 Colt trigger and hammer pins which are 1.000" long and sit flush with the outsides of the lower. There are (intentionally) slightly oversize and measure .1549" - .1550".

Measuring done with a 0 -1" vernier micrometer.

Last edited by tomcatt51; 07-05-2017 at 09:02 PM.
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