9mm AR.. Midlength Vs Carbine?


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chad1043
April 6, 2013, 02:58 PM
Hi guys, Since the 9mm uses blowback to cycle and not a gas system. What is the pros of going with a midlength vs a carbine?

Thanks

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jerkface11
April 6, 2013, 03:16 PM
Longer sight radius and more real estate on the handguard.

briansmithwins
April 6, 2013, 03:20 PM
Plus you can use a bayonet with the middy as the flash suppressor is the correct distance from the bayonet lug.

Since it's a 9mm you might want the sticker handy.

BSW

chad1043
April 6, 2013, 03:22 PM
^^^ LOL

So besides sight radius, there isn't a mechanical reason why?

jerkface11
April 6, 2013, 03:54 PM
It's recoil operated so the position of the sight base doesn't do anything else. If you plan on using iron sights you might as well go with mid length. If you're using an optic it won't matter. Unless you like to stick doodads on rails. Then the mid length gets the advantage again.

briansmithwins
April 6, 2013, 04:29 PM
It's recoil operated

Blowback is a kind of gas operation where the cartridge acts like as a one time use piston and the barrel is the cylinder.

For recoil operation you need the barrel and bolt to move in respect to the receiver.

BSW

jerkface11
April 6, 2013, 04:45 PM
Uh no.

Girodin
April 6, 2013, 05:51 PM
I've never seen a recoil operated 9x19 AR. I've never even heard of one. I have seen a bunch of blow back action ones

Walkalong
April 6, 2013, 05:56 PM
It does not use a gas port, so it doesn't matter whether it is a carbine length, middy length, etc. The first responses were correct, the only difference is how long the handguard is going to be and how far forward the sight will be.

-v-
April 7, 2013, 02:51 AM
Heck, why not go with a dissipator setup and get the most sight length and handguard real-estate that you can get. They do make a dissy 9mm upper right?

jerkface11
April 7, 2013, 05:28 PM
Idk if they do or not.

NeuseRvrRat
April 7, 2013, 05:37 PM
They do make a dissy 9mm upper right?

not sure who "they" is, but a mock-dissipator 9mm upper would simply involve putting on long handguards and mounting a sight base wherever you want.

you could also forget the sight base and just mount a rail-height front sight on the top rail of the handguard.

fatcat4620
April 7, 2013, 07:17 PM
Just skip the pinned front sight and get a free float quad rail

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