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9/22/2017 12:11:25 AM
Posted: 8/16/2005 4:55:05 PM EDT
I was wondering if you can install a DD, LaRue or YHM Quad rail on a RRA varmint upper with the bull barrel.

I cannot see why. The FF tube that comes with the upper is the barrel nut, standard thread for all uppers.

I thought I read somewhere you cannot do this, but I just cannot see why.

Any comments?

Link Posted: 8/16/2005 5:55:09 PM EDT
I did it with a YHM lightweight. You have to mod the nut a little.
Link Posted: 8/17/2005 6:33:45 PM EDT
What kind of little mod?
Link Posted: 8/18/2005 2:19:13 PM EDT
The RRA FFT should be a one piece tube, meaning the tube itself has the threads in it. All uppers have the same thread I think.
Link Posted: 8/18/2005 5:41:19 PM EDT
Yes, the threads are the same but the nut still won't fit over the RRA bull unless you bore it out a just a nut hair. 2 minutes with the rotary tool of your choice and polish or I think YHM will do it for you for a couple of bucks. The nut is not threaded all the way on the instide. I don't have a picture but you will see when you get the tube.

It was REALLY easy. (Aluminum is very soft)
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