Nice conversion of a semi:
All you need to top that off (cheaply) is a Combat Bolt Handle.
Adds to the coolness military factor, and lets you retract the bolt from any angle with any hand/finger/elbow/forearm/knee/foot... whatever.
I just did up a Rem 1100 with Choate Mark 5 stock and forend and combat bolt handle. The handle adds lots to the image. Worth the $10.