Does anyone out there have any experience with the AK47 Recoil Reducing Stock Tube? I'm trying to figure out if the stock tube accepts Mil-Spec or Commerical buttstocks. I would imagine it's commerical butt stocks but i can't tell just by looking at it.

http://www.israeli-weapons.com/store...stocks/p14.htm

Any help would be greatly appreciated!

- Cassidy