just keep loosening and retightening until it's close enough force into alinement. use plenty of grease, especially between the barrel extension and barrel nut.
Printable View
just keep loosening and retightening until it's close enough force into alinement. use plenty of grease, especially between the barrel extension and barrel nut.
Hi guys
Andy in italy here
I removed the barrel nut to install a larue rail on my
Oly k3b, and i got this problem.....
I cant match the hole on the receiver with the hole in the larue barrel nut. To install it i have to overtorque the barrel nut so the holes match and i can install the gas pipe.
Same with the original barrel nut. I overtorqued it but now i have canted fsb.
If i use low torque, so holes match, i can remove the barrel nut by hand...
What i should do?
How should be the right torque value for the barrel nut?? I have to use a torque wrench to do the work?
Thanks for the help and sorry for my bad english
Andy
Torque it over to the next closest hole. I guess you are using a torque wrench? Don't get all wrapped up in a specific torque spec. I think the Larue instructions simply say to tighten the nut three times and then torque it over to the next hole. No specific foot pounds.
Oh by the way, we call it a gas tube over here. A gas pipe is what heats my hot water. :D
Lol...
Ok for the gas tube.....:D
Well i have same problem with the usgi barrel nut.
I cant allign it and i have to overtorque it to the next hole...
Why i have to tighten it 3 times?
Torquing three times helps to mate the threads and slowly work your way to the next notch.
The two LaRue barrel nuts that I've done both took a lot of torque to get aligned. It looked to me that the holes on the LaRue nuts are a bit further spaced than on a USGI nut.
If you're mechanically inclined and have a feel for torque, you don't really need a torque wrench. The accepted torque range is 30 ft-lb (40 N-m) to 80 ft-lb (108 N-m) if you have access to a torque wrench.
Does the fsb only appear canted or did you verify by shooting?
Well my rear sight is completly on the left.
Ok , larue barrel nut could be made overtollerance, but the usgi barrel nut should be milspec and i have problems to allign it too
Why put a premium rail on the worst AR in the world? :confused:
Cause in Italy ar15 are scarce and damn expensive... So i have this
Oly and only others 3 ar15.. So i have to work on what i have:mad:
Something sounds wrong about this - what I wonder is how the FSB can be moving. This shouldn't happen. There should be no lateral movement of your barrel.
All that moves is the barrel-nut, which at some point when tightened will give you the opening for the gas-tube.
Perhaps a picture?
Not to be redundant - but you have a barrel which is mounted in a barrel-extension, right?
Well when i bought it i have not noticed a canted fsb. I took it, fire 1 time then i removed the fsb and installed a larue ris and a gg&g gas block with folding front sight.
So without a fsb as reference i didnt notice if it was canted.
Then i changed set up, installed a kac rail with the original fsb and a buis rear sight. Only when i zeroed the sights i saw my rear on the top left. So i check the fsb and saw it canted on the left.
Bot barrel nut, usgi and larue must be overtorque to match the gas tube hole.
So, or the original fbs was mounted canted from Olympic arm ( barrel is original, with original barrel extension) or the overtorque tquist the barrel , but i donthink.
I tryed also to add part of a peeler washer on the side of the barrel pin( on the top of the receiver) but nothing change.
Now i ordered 2 different barrel nut and i will try to mount it as described on the usgi manual...
Again i apologize for my bad english. I dont know most of the words i wish to use
Maybe some detailed pics would help?
Without a torque wrench, you do not know how much torque is being applied. I do not think you are over torquing anything. But to be certain, use a torque wrench.
Over torquing the barrel nut will not cant the FSB. The FSB is canted because something is not aligned correctly. It is likely the FSB is was not aligned correctly when it was installed on the barrel.
No apologies necessary. Your English is far better than my Italian!Quote:
Thanks for the help and sorry for my bad english
Andy
From what I'm gathering - our poor Euro shooting-brethren are blessed with very limited access to anything quality AR, kinda like here, when "Bushy" was able to keep up the myth.
Before other manufacturers started making better products.
Apparently Bushmaster and JP ent. are the gold-standard over there.
How does one say - in land of the blind a one eyed man is king.
I have only read this so not sure it will work but sometimes the notch on the upper were the barrel lines up to maybe to big allowing the barrel/FSB to move. I read that once you align the barrel/FSB you can stake that notch to basically remove any movement of the FSB. Once again just read that online when I was installing a barrel.