Well I've been a bit busy since this thread got started as well. If you want to I have another carbine design here...
Introducing the M-85c, a small, specially designed weapon ment to take on lightly armored targets (I.E. infantry wearing body armor, jeeps, etc.) It fires a specially made 5.56x80mm hard-tipped round. Because the bullet is low-caliber but high-velocity, the weapons recoil is still managable (especially with the recoil-absorbant buttstock) while providing a decent punch and good accuracy over short-medium range.
Thanks for all the top of the line work already done, and all the offers to help make these weapons