I liked the design enough to wonder what a fully auto carbine would look like. so here is a WIP.
FORGOT TOP RAIL FOR LEFT SIDE PIC ARGH..will fix later.
has extendable buttstock, with recoil absorber, chamberd in 6.8mm. Bolt locks in open position after firing the last shot, rack it back further and release after inserting a fresh magazine.
Added longer RIS rail
new Iron Sights
new flash supressor