This is not going to be an article. I honestly just made this so i can go back to it as a reference and show it to others. There are hundreds of articles that explain all this shit. AR gas systems. Pistol Length Barrels less than 9” Gas tube length 4.5” Carbine length Barrels 10-18” Gas tube length 7.5” Mid-Length Barrels 14-20” Gas tube length 9.5” Rifle length Barrels 20”+ Gas tube length 13” Carbine Length vs Mid Length Gas system. What is the point? AR's with barrels between 14-18 inches can use either, which is better? The short answer is Mid Length The longer gas system is going to provide less pressure going back to the bolt, less pressure is better for longevity and will reduce felt recoil. Mid length gas systems will have a slower rate of fire. measured on a 14.5 barrel using NATO M855 Carbine = 864 rpm Mid = 737 rpm. For more info this report from NAVSEA has a ton of info, even on shit that will never effect you. https://partner-mco-archive.s3.amazonaw
We're going to talk about everything I feel like talking about related to guns. Are you anti-gun? (aka uninformed), then you are in the right place.