AR-10 barrel profile and the effect to accuracy..

[ERA]

Hi. I am planning an ar-10 build up based on Armalite parts.
I want the rifle to medium in weight, but still to stay accurate. Most AR-10:s built on accuracy purpose have felt relatively front heavy as I have tested them.

However this was not the case with OA-10 SASS with PRI III gen tube and Magpul PRS stock, which I tested last spring.The rifle is accurate shooting 2-3" 10 shot groups from 300m with rapid fire.This rifle has Stainles steel Lothar Walther 20" barrel with SPR type barrel(diameter 0.75")in 1/12" twist.
The OA-10 is no longer in the standard list of Oberland arms. I am not sure, would it be possible to custom build one at the factory.

<span style="font-weight: bold">As I shot this rifle, question raised up. Does the barrel diameter in an AR-10 have to be 0.875-1" to be accurate?</span> This OA-10 certainly was not inaccurate. Is this however normal, with non chromed stainless steel SPR type profiles or equivalent.

The barrel length on my AR-10 buildup would be most likely 22", with rifle length gas system. However I am still giving a thought on 20" with rifle gas and 23.5" with extended gas. The caliber would most likely be 308win.

 

[sinister]

Re: AR-10 barrel profile and the effect to accuracy..

Quality of the barrel work is more important than outside diameter. I think you will be very pleased with a 22-inch Walther (like mine).

 

[ERA]

Re: AR-10 barrel profile and the effect to accuracy..

That is nice looking rifle you have there. I was thinking of painting mine dark olive green.

 

[Maestro Pistolero]

Re: AR-10 barrel profile and the effect to accuracy..

I have a 20" Armalite "T" barrel that I just had threaded for a Vortex FH and re-crowned. It shoots 1/2 MOA if I do my part.

I was banging steel with it consistently out to 900 yards with it today using Federal 168 SMK's. I have never shot anything past 300 yards before today. I am thrilled, needless to say.