Ok just so I was not talking out of my A$$ I just pulled my buffer it weighs 5 0z it is a solid buffer,,,, I have shot both supressed and unsurpressed 147, 187, and 220 and have never had a issue of any kind.... so I am thinking 5 oz is not a H3 so if I said the wrong thinmg my bad but I am still learning too.... my barrel is a 10 1/2 pistol lenght gas tube now one thing I know will help if you are short on gas is a pigtail gastube it has extra lenght and will capture more gas as i understand it ... maybe?