Re: Drop in triggers
Caution with "drop-in" AR15 triggers on a rimfire - you will probably end up with split rims from the firing pin.
I run a RR two-stage in my M&P15-22, but use the original springs with no problem. A buddy used a the same trigger, but did not change springs - he's splitting rims with the firing pin and having ejection issues. I'm sure it's not too good for the FP.
Kevin