Barrel movement ar-15
- Thread starter maddenfreak13
- Start date
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Bigchillin83
Well-Known Member
Yes, that's why they say anytime you are shooting a rifle for accuracy, use rest only on stock or forend... It will
Flex a little
Flex a little
No. If there is any movement in your barrel laterally, or fore and aft in the upper receiver itself, something is wrong. The barrel to upper receiver should be rigid, zero movement.
Unless you are experiencing very slight movement at the barrel tip caused by upper and lower receiver gap, or excess clearance between the upper receiver and lower receiver.
The barrel to upper receiver should be rigid, zero play in any direction, when assembled properly.
pretty much every gun's barrel flexes a bit when firing, but you shouldn't be able to do that with your hands. Something isn't right, walk back through your install or take it to a smith if you aren't sure, it isn't worth the risk of injury to save a few bucks
"I torqued barrel nut to spec,"
what does that even mean.I have built 2-300 ar15s and Ive never went
by spec on anything because every upper and every lower acts different.
I slip bbl in and tighten the bbl nut till super tight and slip a nail in to make
sure clearance for gas tube,then I back it off and do that 2-3 times till it
is tight.I do use a little greese to get it past tight mark on first turn.
what does that even mean.I have built 2-300 ar15s and Ive never went
by spec on anything because every upper and every lower acts different.
I slip bbl in and tighten the bbl nut till super tight and slip a nail in to make
sure clearance for gas tube,then I back it off and do that 2-3 times till it
is tight.I do use a little greese to get it past tight mark on first turn.
If you don't know what his statement means, I hope you are the only one shooting the 2-300 ar15s you have built.
dk.easterly
Well-Known Member
There's a reason I won't buy a home "build" from a lot of people.
I have never had 1 issue on any of them.At least not any that were due
to my work.And no,They were for other people.Worked for a gun shop for
years in my off time.
I think its just a matter of wanting perfection and being mechanically inclined.
And not just with a Phillips screwdriver.I worked in a metal shop and other
related shops before,so that did help to recognize problems that could occur.
I do know what spec means,I just don't think it is spec anything on an ar15 or
they would have put specs in the instruction book and cd that they sell all
the time to assembly and disassembly an ar15.
A firearm is not something to have any doubts on.If you have 1% doubt you
can not do it. DON'T !!!
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dk.easterly
Well-Known Member
But there are torque specs listed in an AR Armorers book...
So you did know what he meant but you wanted to paint yourself as a professional and attempt to belittle someone who came here looking for assistance because he asked a question in a manner you didn't like. Got it.
Torquing a barrel nut to spec:
1. Tighten the barrel nut to 30 foot-pounds.
2. Loosen it a little bit.
3. Tighten the barrel nut to 30 foot-pounds.
4. Loosen it a little bit.
5. Tighten the barrel nut to 30 foot-pounds.
6. Loosen it a little bit.
7. Tighten the barrel nut past 30 foot-pounds to the first spot where the gas tube can be installed. It is now timed and torqued correctly.
Dave Porter
New Member
The correct solution
I am sorry so many responded to your question and apparently missed the issue.
You need to use one or two or more (?)
shims usually supplied with the hand guard. Your problem is the barrel nut is bottoming out against the upper receiver without pinching the barrel flange. A very common problem. By adding shims you will clamp the barrel tightly with the torque value being applied to clamping pressure not by touching the upper. Any firm tightening torque value above 35 foot pounds is sufficent with 50 to 55 ft lbs ideal by many on this forum. If you need any additional guidance on this subject message me and we can talk
on the phone.
Dave
I am sorry so many responded to your question and apparently missed the issue.
You need to use one or two or more (?)
shims usually supplied with the hand guard. Your problem is the barrel nut is bottoming out against the upper receiver without pinching the barrel flange. A very common problem. By adding shims you will clamp the barrel tightly with the torque value being applied to clamping pressure not by touching the upper. Any firm tightening torque value above 35 foot pounds is sufficent with 50 to 55 ft lbs ideal by many on this forum. If you need any additional guidance on this subject message me and we can talk
on the phone.
Dave
Dave Porter is correct. The new barrel that came with the KMR is proprietary to that handguard the new proprietary nut is slightly out of spec to the existing barrel extension on your barrel. even though the nut is tight there is a space between the shoulder on the extension and the front wall of the barrel nut. This is easily remedied with the use of barrel nut shims that you can purchase in a set. (thin washers of various thicknesses that will take up that space) https://www.ebay.com/itm/5-56-Free-...821524?hash=item4d558d8bd4:g:7C8AAOSwV0RXtkIL
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No that is not what I said at all,,mr know it all.What parish are you in,?
I just want to make sure no one calls on you for fixing anything or actually
knowing laws.Get over yourself man...Until you have had actual experience
doing what some one is asking,then by all means speak up,if not shut your
google fu the &^*&&^^& down ...
I simply stated when it comes to putting ar15s together,there is no
one perfect spec,everyone of them are different.
Different lowers,different uppers,,diff companies making many different
parts.And please do not use shims,if you need shims on an ar15,you
have done something wrong or about to.
I trust very few real gunsmiths for this very reason.I have seen some
pretty messed up stuff.If you cant figure out the problem on your own,
with youtube videos and 1000s of other videos,then I'm betting you
should not be on that end of the project
Good luck and I hope you find a decent gunsmith.I know very few good
ones.
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dk.easterly
Well-Known Member
Ah.
Didn't know we had a Certified YouTube Armorer in the house.
Didn't know we had a Certified YouTube Armorer in the house.
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