Yes.
AR-15 accuracy issues trouble shooting
- Thread starter Rab1515
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Yes.
True 5.56 barrels are inherently less accurate than Wylde and .223 chambers because of the longer lede section that puts a gap between the ogive and the rifling to allow the bullet to move before making contact with the rifling, preventing extreme chamber pressures. Some people call the space "jump" and blame it for reduced accuracy.
There's still room for experimenting with different rounds for the barrel.
Take note of not only the bullet weight but also the shape of the front and back of the bullet. Some guns like a boat tail bullet, some like a square straight back. Sometimes hollow point will make a difference. My AR shoots boat tail hollow point 62gr the best; my wife's AR isn't so picky.
There's still room for experimenting with different rounds for the barrel.
Take note of not only the bullet weight but also the shape of the front and back of the bullet. Some guns like a boat tail bullet, some like a square straight back. Sometimes hollow point will make a difference. My AR shoots boat tail hollow point 62gr the best; my wife's AR isn't so picky.
OrbitalEllipses
Ultimate Member
Loctite #620
Permanent sleeve/bearing threadlocker is appropriate for this application?
clandestine
AR-15 Savant
Why are you asking the same thing I answered?
clandestine
AR-15 Savant
He would be wrong. #620 Loctite is the proper product to bed the Barrel to the Upper Receiver. Its also preferrable to Permatex when sealing Gas Keys to the Bolt Carrier.
The proper use is important. It only goes on the outer surface of the Barrel Extension, NOT on the Upper Receiver or Barrel Nut threads. Threads get 33MS/Aeroshell 64 Grease.
Its not "permanent", the Barrel can be removed is the Builder/Armorer/Smith has a padded vise and a block of wood.
The lower value of Torque on the Barrel Nut is preferrable if possible. Lower torque values mean less stress and distortion. I cant count how many customers that have brought me ARs that were not shooting well and in cases where the Barrel was not the cause, it was high torque values applied to the Barrel Nut and/or the Muzzle Device.
If people think I am giving bad info they are free to ignore my advice.
Here are pics from my class about bedding:
clandestine
AR-15 Savant
No offense at all with you wanting explanation.
The other guy was looking for a fight.
OrbitalEllipses
Ultimate Member
You're so defensive. Never did I say it was wrong, I simply asked if a permanent threadlocker was the most appropriate compound. Beyond that Permatex and Loctite are the same company, using the same part numbers.
I'll feel free to ignore the words coming out of a disagreeable hothead, regardless of their verity.
Oh shut the **** up Chad. I wanted to know why it's a better choice over blue, red, or purple. Blue and red will fail under heat eventually. Get over yourself dude.
clandestine
AR-15 Savant
I never claimed they were different companies. They are different products. The permatex Gasket Sealer does a poor job for Gas Keys, the #620 Loctite does a great job for Gas Keys and Barrel Bedding.
You were looking for a fight, and you wont bait me. As far as "shutting the up", that wont happen as long as people value my advice and experience.
Semper Noctem
Desk Rabbit
IBTL...
Or one could just buy one of the newer tighter spec'd BCM uppers. In my experience, the barrel to receiver fit is perfect requiring just a little heat on the receiver.
I've used this too (might have pulled the wrong one off the net). Seemed to work. I think it's more or less the 620 in a stick form. I've also used it to put a front sight base on with no pins or anything. Held until I took it off. Shot a couple position matches using the sling and all.
http://www.amazon.com/Loctite-39150-Temperature-Bearing-9-gram/dp/B0053ZNOFK
What's the max temperature one could expose a barrel/receiver to and not damage it? I haven't really been able to come up with a solid number. Some time in the oven at 482° F would take care of the 620 according to the spec sheet. IIRC, a lower temperature softens it up too.
I've used this too (might have pulled the wrong one off the net). Seemed to work. I think it's more or less the 620 in a stick form. I've also used it to put a front sight base on with no pins or anything. Held until I took it off. Shot a couple position matches using the sling and all.
http://www.amazon.com/Loctite-39150-Temperature-Bearing-9-gram/dp/B0053ZNOFK
What's the max temperature one could expose a barrel/receiver to and not damage it? I haven't really been able to come up with a solid number. Some time in the oven at 482° F would take care of the 620 according to the spec sheet. IIRC, a lower temperature softens it up too.
clandestine
AR-15 Savant
Yup. Lots of BCM uppers are very tight at the mouth where the barrel fits. No bedding needed.
The down side is they are often too tight to use a lapping tool unless you heat the upper to about 200+ degrees.
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