Anyone know how tight to torque the barrel nut for an SAR? ***FINISHED with Pics***
...PICS IN THE LATEST POST...
So I'm finally getting around to installing the SAR that I bought over a year ago...
But I ran into a problem. I seem to have lost the little instruction sheet that came with it. I can't remember what the target torque value for the barrel nut was, but I seem to remember it being higher than most. Any help would be appreciated.
Also I'm taking a bit of a break to try to let the Kroil that I applied to the pins in the standard FSB soak in a bit. I just bent my punch trying to remove one pin and other than marring it a bit (and bending the punch) it didn't seem to have any effect at all. I have heard that they can be pretty tough but have never removed FSB pins myself. If anyone has any suggestions for making this procedure a bit easier that would be appreciated as well...
ETA: I do know that these pins are tapered and I am trying to drive the pins out using the smaller side.
SAR barrel nut requires 60 FT. lbs
Did you have any success removing the FSB taper pins?
I was starting to get frustrated yesterday so I put it down and watched a movie. I regularly applied a bit more Kroil at times throughout the evening and this morning before going to work. I just got home and will be giving it another go this evening. Hopefully the Kroil has had enough time to really work its way in there.
So I was able to get the pins free tonight and am in the process of installing the SAR. I bought a large nail set and that made all the difference as it was much less likely to slip off of the pin. I ruined about 3 punches on this project...
I am a bit confused by the tensions screws now. I screwed the the outer two very tight and then tightened the middle one a bit, but not too much afterward. Did I do this the right way?
I still can't figure out what I did with the directions.
Sounds like you installed the rail correctly.
Here's a copy of the SAR install instruction for future reference.
Hope this helps :)
SAR installation instructions:
1) Remove your existing rail, gas block and barrel nut.
2) We recommend using Aeroshell grease 33MS (MIL-G-21164) on the upper receiver threads or the barrel nut threads.
3)Install the Titanium SAR barrel nut using a 1 1/8" wrench.
4) Torque barrel nut to 60 FT. LBS.
*If a piston system is to be used you will need a shim kit (sold separately) to clock the barrel nut so that one of the wrench flats is parallel to the top of your upper receiver. IF no piston kit is used ignore this and install without shims.
5) Loosen the outer T25 Torx screws on the SAR rail aprox 4 turns.
6) Lightly tighten the center set screw to spread the SAR clamp by holding onto the short end of the Allen key. This will apply aprox 15 INCH lbs of torque. This does not need to be very tight, you are just spreading the clamp.
7) Slide the SAR rail over your barrel and onto the barrel nut. Clock the anti rotation tabs onto your upper receiver and push the rail towards the receiver until it makes contact.
8) Loosen the middle set screw aprox 4 turns.
9) Tighten the 2 T25 Torx screws to no more than 35 INCH lbs of torque.
10) Tighten the center set screw by holding onto the short end of the Allen wrench. This screw will now act as a jam screw and lock the others in place.
Outstanding! Well done, sir :)
Originally Posted By Jason121580:
Outstanding! Well done, sir :)
Thanks man, I'm glad that it worked out.
The nail set made all the difference...