AR15 accuracy re: barrel nut

knownalien · May 14, 2013

Will a barrel nut that is too tight effect accuracy? Conversley if it is too loose will it do the same. I recall the spec was 35 ish lbs. of torque.

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Russ D · May 14, 2013

35-80 ft lbs. It must be in that range. Its not something you can tune so it's not worth considering. You tight to 35 and go to the next slot for the gas tube. Never loosen to get the tube aligned. Start there and then worry about other factors. Anything over 80 ft lbs. And perhaps it could be an issue.

knownalien · May 14, 2013

Yep. Thats what I did. Hmm. 1:7 daniel defense barrel 62 gr lake city brass. Iron sights. 7" groups at 50 yards. Seems really bad. Then again, with irons the post covers up a 5" diameter circle even so i lollipopp the sight. ??

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armed ferret · May 14, 2013

with the barrel nut off, how loose is the barrel extension in the upper?

i know of a couple pro smiths that work at rather well-known companies building "sniper" type firearms, and they often say if a barrel extension is wiggly (even just a bit) inside the upper, it COULD affect accuracy, and they'll use loctite on the barrel extension to help bed to the upper.

is the barrel floated or do you have a delta ring and standard handguard assembly? crown okay?

try different ammo, maybe go to 75 or 80 if it's a 1:7.....

knownalien · May 14, 2013

No wiggle. Free floated. Crown is fine. 16" barrel.

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alucard0822 · May 14, 2013

Russ D said:
35-80 ft lbs. It must be in that range. Its not something you can tune so it's not worth considering. You tight to 35 and go to the next slot for the gas tube. Never loosen to get the tube aligned. Start there and then worry about other factors. Anything over 80 ft lbs. And perhaps it could be an issue.

this

and grease the threads.

knownalien · May 14, 2013

Already used molly grease on the threads.

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smokey · May 14, 2013

give the rifle to someone else and see what groups they get? Toss a magnified optic on there and see what groups you get? I'd rule out the shooter first, then the ammo, then start poking around the gun itself.

BradMacc82 · May 14, 2013

62gr greentips aren't exactly match ammo to begin with, over irons as well - not a recipe for precision shooting, IMO. Not saying it can't be done, but your not helping yourself out any with greentips.

Second smokey's suggestion and ferret's recommendation of a diff't weight of round, letting another shooter try, and going to an optic.

Russ D · May 14, 2013

If you come up to Hap I can help.

knownalien · May 14, 2013

Ok russ. Next time I go ill tell you.

Thanks.

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armed ferret · May 14, 2013

gimme a heads-up and i'll join ya.

wanna do some more load work with the 308 anywho.

knownalien · May 15, 2013

Will do.

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jrumann59 · May 15, 2013

knownalien said:
Yep. Thats what I did. Hmm. 1:7 daniel defense barrel 62 gr lake city brass. Iron sights. 7" groups at 50 yards. Seems really bad. Then again, with irons the post covers up a 5" diameter circle even so i lollipopp the sight. ??

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Are you standing or bench shooting. If you are standing that is not too bad if you are bench shooting work on you breathing or your trigger pull.

armed ferret · May 15, 2013

or both.

AR15 accuracy re: barrel nut

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