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Old 02-25-2011, 02:36 AM   #1
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Default Carbine vs. Mid for first build

Hey guys, I've been looking around this site for a while but this is my first post. I am in the process of building my own AR and I decided to buy a complete upper. I am having a problem deciding between a carbine and a mid length. The gun will mostly be for short target shooting and some zombie removal I guess what i'm looking for is advantages/disadvantages to each type. Any help is greatly appreciated. Thanks!

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Old 02-25-2011, 02:45 AM   #2
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please give us an intro in the new member section

as to your question i personally see no point of carbine length if you dont have a short barrel permit. mid length gives a smoother recoil impulse. optimal is rifle length. carbine length is a short fast impulse as it drains gas from a higher pressure barrel point than mid or full.

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Old 02-25-2011, 02:47 AM   #3
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Mid length will shoot a little softer/smoother. Some say its easier on the internals as well. Plus it gives you a longer sight radius.

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Old 02-25-2011, 02:48 AM   #4
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What length barrel? Assuming a 16", I'd go with the middy if your going to order a new upper for your build for the reasons JonM stated

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Old 02-25-2011, 04:23 AM   #5
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ISix of one, half a dozen of the other, so to speak. Differentiating between the recoil impulse of a mid length gas system and a carbine system, both on 16" barrels, is not terribly easy to do. The mid length gas system is a "solution" to a problem that didn't exist.

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Old 02-25-2011, 01:23 PM   #6
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I agree with the above except Jeep. Jeep does make a point but Midlength gas is ideal for 14.5-16". If you're going say 11.5-14.5" carbine makes sense. There is overlap at 14.5 but carbine isn't the best choice at 16".

ETA:
And since the cost is roughly the same, why not choose the best solution for your barrel length...

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Old 02-25-2011, 03:44 PM   #7
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Heres some great info on different gas systems. Lots of people think the 16'' carbine operates at a higher pressure than a 14'' but it doesnt. I does have a better dwell time though.AR15BARRELS.COM - Randall's description of AR gas operation and how everything works in harmony I have heard lots of good feedback on the middys by owners. And I am verry happy with the way my Carbines run. I would like to own all the different length gas systems someday

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Old 02-25-2011, 07:54 PM   #8
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Excellent write up by Randall as usual, thanks MrMilspecer!

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Old 02-26-2011, 12:16 AM   #9
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Thanks for all the info, decided to go with a 16" mid. It will be here on Wednesday!

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Old 02-26-2011, 12:23 AM   #10
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Specs on the barrel?

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