Hi folks, planning on buying couple of cans but undecided on either to go sig Qd route or stick with old reliable surefire socom2 . These will be in 5.56 & 7.62, with an average of 8000-10,000 rounds a year. I am mostly concern about the difference in gas blowback to shooter's face between both. I have no experience with Sig's but the huge difference in price from Surefire is looking very attractive. I will appreciate any input folks ....Thanks