Design for a lightweight backpack carbine, meant for hunting and wilderness survival use.
Uses .380 ammunition to provide a good mix of low bolt thrust (ensuring a minimum-weight gun) and substantially increased power over .22LR (should be adequate for game up to and including small deer).
.380 Auto caliber, straight blowback action, 9-round magazines.
14" barrel to provide optimum performance, with permanent 2.5" compensator/flash hider for legal compliance.
Underfolding metal stock with rubberized buttplate, 31" overall length unfolded, 21" when folded.
Milled aluminum receiver and polymer grips, total weight should be under 4 lbs.
Iron sights integrated into detachable carrying handle, to minimize snags while traveling through underbrush.
Estimated performance: 1350 fps muzzle velocity, 540J muzzle energy, effective range 120 meters.