Originally Posted by
Defaultmp3
Typical AR-15 BCGs are ~11.5 oz; typical AR-10 BCGs are over 19 oz, so close to half a pound of difference. An Aero Precision M5 receiver set is 24.7 oz, while an AP milspec forged receiver set is 15.25 oz (an AP AR-15 billet set is 17.8 oz), so again over a half pound of difference. So that right there is one whole pound. Even barrels do have a different weight between large frame and small frame, even if about the same overall profile; for a Criterion hybrid profile, the .308 Win barrel is consistently close to half a pound heavier than the .223 Wylde in the same length (looking at 16", 18", and 20"). For a 13" Centurion Arms M-LOK CMR, there is a 4.7 oz between the large frame and small frame.
So I think you're looking at 1.5 lb penalty pretty easily if you're trying to like-for-like on the design between a small frame and a large frame, if you're going to do an equal profile barrel rather than equal weight. You could certainly get the lightweight parts instead of the more standard parts on the large frame and bring it back down to weight, if you really wanted, e.g., V7 has a ~6.25 lb .308 Win 14.5" gasser, but then a corresponding V7 14.5" small frame is ~4.5 lb.
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