Weighs about 7lb ish. Balances well esp. the pistol version. Weight is over the magwell. The arm brace on the pistol also swings to the left and for,some reason, I could not get it to lock. It was sort of flapping around. The SIG reps were not too helpful with it. Guess they were tired. About the same weight as Piston AR. Has quad rails. The trigger was definitely stiff, heavy and gritty on the show gun. Could be the one gun but I didn't test them all. The stock is not Magpul comfortable. I was wearing a cotton shirt and when I tried quick shouldering the rifle, it would slip and ride up. May work better with webbing on. I don't know...