Proprietary barrel nut blocking gas tube

[onebigelf]

I'm replacing the factory barrel and the factory FF handguard.  The new handguard uses a proprietary barrel nut similar to the one pictured (not exactly, the one pictured is an AR-15 nut downloaded from the internet, but they look about the same).  There is no keyway of any kind for the gas tube, it's not a timing issue, and the barrel nut is large enough in diameter to slightly block the cloverleaf in the upper receiver so that they gas tub won't fit through.  Am I missing something?

 

Thanks,

John

[jtallen83]

Who made the handguard? I ran into this on a cheap handguard I had got this summer, sent it back for a refund. It was supposedly made in Ohio but it looked like Chinese junk. Can’t remember the brand but the nut looked very similar.

EDIT;

Acme Machine: https://www.acmemachine.com/products/ar-308-15-ultralight-keymod-gen-ii-free-float-handguard?variant=12380785672277

Edited September 18, 2018 by jtallen83
clarity

[survivalshop]

Barrel nuts like that pictured are supposed to be of smaller diameter so as to let the Gas Tube pass into the Upper Receiver with out restriction . From the looks of the type of Nut , it can be turned down on a lathe to allow Gas Tube clearance with out restriction into the Upper Receiver & keep enough threads for HG clamping Screws. Of course that would all depend on how much the Barrel Nut is restricting the Gas Tube passage .

 You can also set up the Barrel with proper torque & mark where the passage of the Gas Tube will pass over the Barrel Nut & make clearance for it .

Or you can contact the Manufacturer about the issue  & or return the item for full refund .

[onebigelf]

Thanks.  I'm going to mark and grind a flat on the top.

Gotta love flying sparks....

 

John

[Mjwilks07]

I think we bought the exact same handguard and have the exact same problem. Did grinding it fix it?