I headed to the range today with my two shooters and my new snail drum. What a blast! I did experience some difficulty inserting the S.D. (w/20 rds) with the spring unlocked, and getting the S.D. to lock in the mag well. I had to lightly pound the S.D. while holding the grips until I could hear the mag disconnect go click. So a little more fiddling is necessary. But, it was cold outside and I ran out of time. She'll be right with a little more love and attention. I'll provide an update later. Boy, this S.D. is fun!