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AR barrel profile suggestions

SquarePizza

Sergeant
Full Member
Minuteman
Jan 9, 2012
526
165
44
NY
Tl;dr: I am not an AR guy but want to build a light 6.5 Grendel and need help picking a barrel


Long story:

I do gun runs and PRS. I’m not great at either, usually middle of the pack. I shoot matches because I enjoy them, not because I’m chasing first place.

I’ve gotten myself in an annoying place. Gun run coming up? Gonna shoot my Tavor a bunch. Then PRS or a DMR match is coming, time to switch to my TRG.

I feel like I’m always jumping around and never mastering my rifle. Years ago when I was just shooting a bolt rifle, I felt like I handled unknown distance and ranging a lot better than I do now.

What I want to do is build the lightest functional 6.5 Grendel AR that can do both match styles ok-ish. That way I can just shoot one rifle the whole damn year.

My problem is that I don’t know ARs. Who makes decent barrels and what profile should I use? I don’t want to go so light that it can’t handle a 10-20 round stage. But I don’t want the rifle to be over 10lbs. And in reality it’s usually awhile between rifle stages so it will have some time to cool down.

*edit* Price is somewhat of a factor. I would love to run a carbon fiber barrel but dropping $800 for a barrel alone is too much when I also need glass and all upper parts. I’d like to be around $1k or less for the whole upper (before scope). With savings on the upper used towards the glass.
 
My Lilja 17.6” is .650” under the handguard, then steps up to the shoulder, down to .750”, then to .740” to the muzzle thread shoulder.

With a 2.5-10x32 Viper PST in a NightForce UniMount, it’s 7lbs 12oz. So light.

It shoots 10rd groups into 1.2 - 1.5” at 100yds rapid-fired. It has done 6 rounds into 8” x 4” at 1000yds, rapid.

I would probably go heavier for matches and get a Criterion from Precision Firearms/Samurai.

Do a medium contour. You’ll be into $850 - $980 for a Bartlein. About half that for a Criterion.

I would probably do an .800” profile under, step, .750, .740, 5/8x24” thread.

With most of the factory 6mm ARC loads, you’ll have less wind drift and drop.

But there are way more factory ammo options for Grendel, about 132 last I checked, to include affordable AAC.
 
I’m pretty committed to 6.5G mainly because I already have a howa in it and have been reloading it for a long time.

I see a JP ultra match in the classifieds with mags and BCG and I really want to snag it, but it’s 22” and over 3lbs so I’m hesitant.

I’m sure it would be a sweat PRS or DMR rig, but running with it on my back for 5 miles and then being asked to shoot a stage standing would be rough.
 
I carried my “PRS Grendel” on my first run and gun. The gun is too light to be truly competitive in PRS, and it is too heavy to be truly competitive in R&G comps. It certainly tips the scale above 10 lbs. Today, I’d shoot one of my lighter weight 5.56 ARs for R&G comps.