You can shoot any of the FX Hybrid slugs with no problem and other brand mid weights too. You do need to rotate your barrel 180 degrees to align the larger transfer port in position. Then its all about tuning .
The M3 has a Superior liner and most like to go to the Superior Heavy liner if only heavy slugs are to be used. Lots of YouTube videos available to help.
Last edited by sidepass; 11/23/22.
