Now let's go down the yellow brick road, an M2, Bar, 1911 ( which has already been done, double stack ) or high power in polymer, I have held a Bar, damn, very heavy and not balanced, off a bipod ok, but off the shoulder, sorrry, your a better man than I am Gunga din. M2's even in polymer, your not going to pull a predator, Jesse Ventura hip shot, no sir, drop it from 250lbs to 150, still going to take a very strong man. JMB did develope a FA lever action with string, pretty cool, look it up.