Handguard install problem

[Iraqgunz]

The barrel nut/jam nit design is well known and massively outdated. We had the same set up on our Bushmasters overseas. The nut is to be tightened and aligned with the receiver. The rail slips over the nut and is tightened down/rotated until is almost to the rear. You then rotate the jam nut towards the rail and torque it down. Once that is done you then tighten the anti-rotation screws.

[ChattanoogaPhil]

I had a YHM handguard. It was near gapless with the receiver rail.

Since the YHM handguard threads onto the barrel nut you're at the mercy of timing luck and threads per inch. IIRC, TPI is 18 so the gap should be between near zero and something less than 1/18th of an inch. You're saying the gap is 1/8th of an inch. Sounds like you're either overestimating the gap or the jam nut wasn't backed off enough to allow the handguard to turn another rotation. When spinning the handguard onto the barrel nut make sure the jam nut is far enough forward that it isn't interfering with getting the handguard as close as possible to the receiver. Then tighten the jam nut against the handguard.

[Sparky5019]

So much fail in that video.

I concur. I think I was just reading your thread about non dimpled barrels/gas blocks. ����*♂️����*♂️����*♂️Why do people still do this?

[titsonritz]

The barrel nut/jam nit design is well known and massively outdated. We had the same set up on our Bushmasters overseas. The nut is to be tightened and aligned with the receiver. The rail slips over the nut and is tightened down/rotated until is almost to the rear. You then rotate the jam nut towards the rail and torque it down. Once that is done you then tighten the anti-rotation screws.

During removal, does the jam nut need to be loosened prior spinning off the rail or will removing the anti-rotation screws be sufficient?