Stern Defense RAB-AD Rapid Attach Buttstock Adapter

Very disappointing! I...

Very disappointing! I was told by a representative from the manufacturer that this would work on a JRC Carbine 9mm. The problem is that the adapter that the Rab-Ad uses has a hollow adapter that interfaces with the bolt, so when you fire your weapon, the bolt can become lodged inside the adapter piece. If they had just created a solid face adapter piece, it would literally work with all 9mm AR-9 style weapons. I've tried several different things (filling the adapter piece with epoxy, rubber, glueing a piece on the end, but everything obviously just falls off after a few rounds. It's a really cool idea, but just doesn't make sense that they wouldn't put a solid-faced adapter piece to interact with the bolt, so the bolt (of any size) would make clean contact with the adapter. Super disappointed.