Beretta Swivel Ring and Stock Swivel Mount for A390/3901

I have an A391 Urika. First of all, no mounting instructions. The ring for the forearm mounts fine and rotates freely. Based on rifles I have with swivel mounts I decided to drill the hole at 3 " from the butt end. When you try to attach the swivel to the stock and drill the hole at the crease that goes down the center of the stock the drill hits an internal ridge which pushes your drill bit at an angle to one side or the other and when you screw the swivel in to the stock it goes in at an angle instead of straight. I re-drilled holes at 2" and 1" from the butt with the same result. I have destroyed my stock in the process! I cannot recommend this product!

Due to the cost, I chose to use this sling mount. The fore end mount was easy to install. The butt stock mount was a bit concerning. After drilling through a few layers of composite, the butt mount threaded in easily to full depth with good holding power. I suppose the butt stock is a honeycomb type construction. An inexpensive means of mounting a sling.