The one piece synthetic stock replaced the detachable wood stock.
It can be mounted on any of the three guns.
This is a very light weight stock, a good idea if you are trying to make
any of the Franchi guns lighter.
Each type of stock requires a different
type of mounting bolt. The synthetic stock uses the one shown above.
It has a flat head but no shoulder as do the other styles of mounting bolts.
It fits completely inside the one-piece pistol grip and stock. It
has a center hole tapped for 1/4-20, and is made of black anodized Aluminum.
It is one -piece, meaning it doesn't need the Pistol Grip parts (59 & 60). Once the mounting bolt is in place and tightened, the one-piece stock is slipped over it and held in place by a long 1/4-20 bolt from under the butt plate into the hole on it. The bolt has a 10mm head.