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Posted: 10/28/2006 8:40:03 PM EST
I see alot of pic with 7.5" barrels. What do you get out of a .223 with a 7.5" barrel besides a big flash and bang?

Anyone chronographed a 7.5" barrel?

I am leaning more toward a 10" barrel for a little more velocity and greater selection of powders.

Any comments?

What loads are used in an AR pistol?


Link Posted: 10/29/2006 6:32:29 AM EST
Anything less than 10.5" cannot be counted on to generate enough velocity to create fragmentation with any known standard 5.56/.223 round.

11.5" is considered the bare minimum.

1:7" twist rate on short bbls. is strongly suggested.

A 7.x" bbl. with Frangible, or possibly 62gr. Soft Point ammo. may deliver a significant-enough wound to justify its usage, but will not generate enough velocity at any point in the round's trajectory to fragment a normal round.

I use 62gr. SPs and Frangibles in my 7.3" 1:7" twist pistol.
I use 62gr. SPs, Frangibles, and 75gr. BTHP (TAP) in my 11.5" 1:7" twist CQB pistol upper

My carbine, not really constrained by such velocity issues, uses whatever, though heavy is better with anything.

Hope that helps.
Link Posted: 10/29/2006 6:58:56 AM EST
I assume you can put any length barrel on a pistol as long as you dont put a stock on with a barrel under 16". Is that correct?
Link Posted: 10/29/2006 7:01:59 AM EST
Yes sir, any length. You can even go over 16" if you want to.
Link Posted: 11/1/2006 9:05:25 AM EST
Link Posted: 11/1/2006 9:54:32 AM EST
Link Posted: 11/1/2006 10:02:36 AM EST

Originally Posted By AR15barrels:

Originally Posted By Kyrinn:
Anything less than 10.5" cannot be counted on to generate enough velocity to create fragmentation with any known standard 5.56/.223 round.

Which does not matter to 99% of the people on this website because most people here are not shooting at other people.

Get whatever length you want, UNLESS you intend to be shooting at Hadji.
Then, get a 308.

So, I'm not supposed to mention that information, is that what you are telling me, sir?
Link Posted: 11/1/2006 10:21:00 AM EST
Its not a .308, but I also have a 7.65x39 upper and was considering buying another and shortening the barrel since it is cheaper to buy a long barrel than a short one, and they are in greater supply.

I assume that I can cut a barrel to any length I want as long as I dont put a butt stock on the pistol lower with a barrel shorter than 16".

Link Posted: 11/1/2006 11:10:55 PM EST
[Last Edit: 11/1/2006 11:12:40 PM EST by AR15barrels]
Link Posted: 11/1/2006 11:22:36 PM EST
Link Posted: 11/2/2006 4:02:26 AM EST
I have seen a 7.62x39 11.5" Model 1 upper at a gun show and the front sight is the same distance as the 16" barrel. I dont know if the gas port was opened, but the port distance had not been shortened. I dont mind cut and try.
Link Posted: 11/2/2006 4:57:45 AM EST
Link Posted: 11/2/2006 6:23:35 AM EST
[Last Edit: 11/2/2006 6:24:37 AM EST by JThomas]
Sorry I was not clear on my description. The gas port is the same distance from the breach end, not the muzzle end. Unless there was a gas port under the handguard separate from the front sight that was closer to the breach.

How is a pistol gas system configured for a 11.5" barrel?
Link Posted: 11/2/2006 8:27:18 AM EST
Link Posted: 11/2/2006 8:32:58 AM EST
These people will know.
They helped me build my 8" 5.45x39 pistol, before I came over to the Dark Side.
Check them out. I'll cross-post there so they'll be expecting you.

Best to you,
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