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Hey all,

So I'm trying to install a Troy VTAC Alpha Rail onto a Core AR15.

The rail will not slide over the grooves of the barrel nut. Also it appears that the installed barrel nut isn't deep enough for the bolts on the rail to tighten down onto it.

I purchased this used. Does anyone have any idea what I need to do. I was led to believe that the rail would attach to my existing barrel nut.
 
My vtac experience was to replace barrel nut with the vtac star shaped barrel nut. Hand guard slides over the barrel nut and then rotated about 15 degrees to lock into place. Good luck
 

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