The F3 Stock Adapter, which stands for "Flush Fit Folder" Stock Adapter is esigned to mount on the standard 4.5mm Bulgarian side folding rear stock trunnion found on most Arsenal AK's (may be found on other models too). The tube offers 9 adjustable postiions for a milspec AR-15 carbine stock (commerical stocks will fit but will be a touch looser) and is cut out on the side so that the tube will lay completely flush against the side of the rifle when folded, even if the rifle has a side scope mount on it. The back of the tube has a screw in plug, and will securely hold the "lipstick" cleaning kit tube- no, it won't fall out even though the side is partially cut away, and yes, you can still fold the stock flush with the cleaning tube in there.
The F3 Stock Adapter is made of 6061 Aluminum with a black anodizing and is 100% made in the USA. (Please note the F3 Stock Adapter is not designed to fit "Russian" 5.5mm rear hinge blocks, make sure to verify which your rifle uses before ordering)
Material: 6061 aluminum
Finish: type III milspec hardcoat black anodizing
Weight: 7.4 ounces
Length: 9.0 inches
100% designed and manufactured in the USA