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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 10-18-2018, 9:39 PM
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Question RTT Tungsten Lower Problem with VLTOR Buffer Extension

I have a RTT in Tungsten that I had put the AR Stoner Mil-Spec Tube in without problem. I decide to change it to VLTOR buffer tube and only able to turn about 1.75 turns into it then it really bind up. I tried this same VLTOR buffer tube in 3 other brand lowers and there is no issue with binding up. What could be the problem here?

Note: the selector sits very very tight in its hole. The bolt catch's roll pin hole is also very very tight. Does anyone have problem with Cerakoted RTT lower?

VLTOR Mil-Spec Tube - 1.75 revolutions into the lower


AR Stoner Mil-Spec Tube - 6 complete revolutions into the lower


Both Tubes - The beginning of the thread is the residue of grease.
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Old 10-19-2018, 11:03 AM
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You might try using a brass bristle brush to smooth out the finish on the threads of the buffer tube. Both finishes might be binding up together like rubbing 2 pieces of sand paper together
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Old 10-19-2018, 11:08 AM
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Saw a video suggesting one uses sand paper to sand down the ridge of the tube/thread. That sounds like it can cause more permanent damage. Any thought on that approach?
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Old 10-19-2018, 3:46 PM
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Quote:
Originally Posted by husadee View Post
Saw a video suggesting one uses sand paper to sand down the ridge of the tube/thread. That sounds like it can cause more permanent damage. Any thought on that approach?


The sandpaper approach seem fraught with problems (uneven sanding and ridges only). You might try a paste cutting compound. This will take off material gradually and evenly.


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Old 10-19-2018, 3:48 PM
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The sandpaper approach seem fraught with problems (uneven sanding and ridges only). You might try a paste cutting compound applied to both surfaces. Slowing and repeatedly tightening. This will take off material gradually and evenly.


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Old 10-22-2018, 12:11 PM
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Last Update: I slow thread the tube in and out in and out which is tight all the way in but it finally went in. Because I was dumb to leave the end plate on the tube while I thread it and out. At one point, I didn't notice the plate rest up against the lower and power thru the turn...stripping about 1/2 a turn off the tube thread. The notch at the bottom practically remove the thread off the tube. But it is in and working finally.
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