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Old December 12, 2017, 09:51   #9
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FALaholic #: 76477
Join Date: Sep 2015
Location: Houston, TX
Posts: 1,851
The holes in the face of the inner nut are meant to be tightened with a free-float wrench to the proper barrel nut torque (35-65lb/ft). Once the barrel is mounted the castle nut is run onto the barrel nut, followed by the freefloat tube. Once you have the tube all the way against the castle nut you then tighten the nut against the TUBE, NOT the receiver. This locks the tube in place without having to tighten it against the receiver. In other words your tightening against the wrong thing in the wrong direction.

Editing: See the studs on the sides of the wrench in this pic? Those are for that type of barrel nut.
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