Originally Posted by Ricky-Ray
With the Plum Crazy Lower's if you use a dedicated 22 upper like the one from CMMG you need to get a narrow hammer from them.
Is this the case also with the LW-15 lower's or is this not a problem?
New Frontier Lowers use the same FCG as the Plum Crazy lowers so the same issue can arise. You can shave them down yourself with a dremel (What I did on my personal lower for a dedicated 22LR upper) or get a narrower hammer.
These should be available from New Frontier soon from what I hear