I have this idea for an ultralight backpack AR-15.
I think I'd base it off a Cav Arms lower (can they still be found?), complete it with a Spikes Tactical enhanced LPK.
for the upper, I'd use a standard M4 flat-top upper with a carbon fiber float tube, JP low-mass carrier, carbon-fiber wrapped 16" mid-length barrel (or, if funds wouldn't allow that a fluted 16" mid-length barrel) and a Vortex flash suppressor. Magpul MBUS rear sight, standard F-height FSB.
Any other ideas as to how I could make this lighter?


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