Depends on the trigger, some are okay for the 15-22 others aren't
The Franklin Binary trigger is okay, says so on their packaging. Some drop in triggers will light strike on the 15-22 though
Also trigger pins are longer, CMC and KNS sell anti walk pins for them specifically, but I've had good luck with running stock parts
The bolt release is proprietary
Changing the grip watch to be sure the grip screw doesn't get crossthreaded because it is screwing into polymer and can happen
I just run factory 25 rounders in both of mine, works great