speedfeed stocks
Hello: my police dept, and two of my personal shotguns, have speedfeed stocks in the standard configuration (non pistol gripped). I have found the quality to be excellent. For example, the stock appears to be solid rather than hollow, except for the shell tubes, and the butt pad screws into bushings rather than merely into the plastic.
As for the shellholder tubes themselves, I have found after being loaded for extended periods, the springs will weaken to the point where recoil will cause a shell to pop out on its own if only one shell is loaded in the tube. If two rounds (full capacity) are loaded in each tube, nothing pops out on its own. Also, after being loaded for a while the spring pressure can slightly deform the crimp on a slug round in the tube making it slightly out of round. I have not seen this occur to the point where it affected function however.
I personally prefer a 3gungear.com stick on side saddle for extra rounds, but really like the quality of the speedfeed stock and it never hurts to have the extra slugs in the tubes. Hope this helps.