I've been looking around and there's talk of adding to OAL with a stock extension
, then somehow rigging a mag lock device...?
Edit: Acutally, the specs say the Sub2000 has an OAL of 30" and a BBL that is 16.1"
If anyone gets info on this, specifically some details on locking the magazine, please PM me. If I find more, I'll post it here.