Quote:
Originally Posted by Dayze
I'm still learning alot about the AR platform, so forgive me if I'm mis-speaking here.
I thought I read somewhere that alot also depends on the barrel type? like carbine, mid-length and rifle (?). Something to the effect of depending on where the gas block/tube is on the different length of barrels can also contribute to shorrt-stroking depending on the ammo (steel or otherwise). I remember seeing some chart that showed the optimal distance of the gas tube/block from the chamber. But I'm sure the lack of expansion of the steel case in battery lets some gases escape that should otherwise flow down to the gas tube/block.
My brain is swimming from reading up on the stuff over the last month or so, so it's possible I'm way off.
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You've got it right. There are three different possible gas systems (well, maybe more depending on how you count it) on an AR 15 pattern rifle: Rifle, Mid Length, and Carbine.
The length of the gas system and its relationship to the barrel length will impact many factors. Under gassed guns will be unreliable. Over gassed guns will prematurely wear and recoil much harder.
Generally speaking, use a carbine length system for anything under 16". The carbine gas system is probably ideal for a 14.5" barrel.
Use a mid length from 16-18". Use a rifle system for anything over 18".
My AR is a mid length with a 16" barrel. I feel like for most people's purposes, the mid length is the right length.