Thompson Center Encore Side Folding Stock By Choate Machine and Tool. This stock fits all Thompson Center Contender Pistols. It quickly converts your pistol into a light, compact rifle. It has an all steel tongue-n-groove locking system and dupont zytel stock. It comes with a 1" recoil pad and 1" grip mounted sling swivel. For Pre-Ban T/C only! Federal regulations specify that you must have a t least a 16" barrel or 14" barrle with 2" extension to use this stock.