To be honest, I like a heavy rifle IRL. It makes the kick nice and soft. My AR-10 with all the crap on it (Magpul PRS, ACOG w/RMR, Atlas bipod, VG6 Gamma comp) is like 11 pounds. Shooting full-power .308, the recoil is so light, I can easily one-hand the whole thing like a pistol.
The mass...