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Old 08-05-2011, 04:05 AM   #11
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Great answers, TekGreg!

Just repeating some of the points, you probably can get a midlength gas system to work with a barrel shorter than 14.5" but it would take a lot of tuning to make it reliable with various ammo, increasing the gas port and playing with the buffer weight and spring, maybe even a light weight bolt carrier. Even in a 14.5" sometimes it's hard to get Wolf and other light powered ammo to be reliable with midlength gas.

It's just not worth it so you see the carbine length gas in shorter barrels.
Quentin, absolutely correct, from what I can tell. The more tuning you do, the more specialized the platform becomes and the more finicky it will be about accepting types of ammunition and bullet weights. Manufacturers have to make a gas system that will devour every known weight/powder combo on the market and therefore are extremely limited by what can be put on a production gun.


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Old 08-05-2011, 06:07 PM   #12
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Quentin, absolutely correct, from what I can tell. The more tuning you do, the more specialized the platform becomes and the more finicky it will be about accepting types of ammunition and bullet weights. Manufacturers have to make a gas system that will devour every known weight/powder combo on the market and therefore are extremely limited by what can be put on a production gun.
Very true, and that's why so many manufacturers have boring guns, they've got to work with almost all ammo a customer is likely to use, otherwise customer support will be a nightmare. When someone takes it upon themselves to assemble their own AR, he has to get up to speed quick on many issues or end up with that "finicky gun" no one wants. Tuning is great if you know exactly what's going on but for the average person it adds headaches.
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