Hey CGN,
For those of you that have jumped on the HK MR223 stripped upper where have you sourced your BCG's from?
Or am I reading wrong and the standard BCG's for gas piston will suffice?
Pro Patria
There is no such thing as standard gas piston BCG. Your number 1 issue is that you have no idea if the whatever non-HK BGC's push rod contact point is not the same as the HK. If it is different, the push rod or the BGC could be out of position, or there is a gap between the push rod and the BGC.



























