I've got a bunch of black dog mags that work great but I just can't get the M&P mags to run in full auto.  No issues in semi.  
Any advice would be appreciated.

Thanks

** Edited to add a fix.  I found that the trip bat was hanging up on the better mag adapter.  Filed off the "ears" that form the channel for the bolt hold open piece just a bit and they function perfectly.  Took off maybe 2mm at the most.  I can try and post a pic if there's any interest.

I'd like to see pictures.
Especially if you have before as well as after.



RCA