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.308 upper problem... solved

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  • till44
    Veteran Member
    • Jan 2008
    • 2604

    .308 upper problem... solved

    Thanks to SpeedTribe for pointing me in the right direction. He suggested I look at the add on rails to make sure none of them were pushing against the gas block. I checked and they all cleared but it led me to check the Noveske QD sling point I had screwed on: http://noveskerifleworks.com/cgi-bin...since=&status= Turns out the QD point was too close to the receiver and there just wasn't enough space for the thing to completely clear the barrel. Now its all liined up and ready to, just need to find the time to take it out. Thanks for everyone else's suggestions and ideas as well.

    Just put together a new .308 upper (DPMS platform). Here is a pertinent part's list: DPMS upper receiver, Rainier Arms Ultra Match 16" barrel, Rainier low pro gas block, midlength gas tube, BABC 7.62, and Troy TRX-E .308 rail/tube.

    Here's the problem: I used the DPMS .308 Claw for installation and PRI barrel nut wrench. Barrel went on fine with no hiccups, no cross threaded threads, torqued to the proper torque, etc. Gas tube and BABC were the same, no issues.

    I placed the TRX handguard on and it looks fine, but after tightening it down I notice that it appears to be leaning to the right toward the muzzle end. I broke it down and then re-assmbled but still had the same problem.

    I contacted Troy and as always they had great CS and were helpful. They returned the handguard and actually shipped out a new handguard, barrel nut, and all three rail portions. The packaging slip said returned old rail as rail was defective. I was hoping they had looked at it and saw an obvious flaw but after installation I am back at square one: a barrel and handguard that are not parallel.

    I contacted Rainier next. They were also helpful and suggest I swap the original barrel nut for the new one. I was thinking the same thing as it's the cheapest and easiest option to check next. they were hesitant to say it was their barrel and wanted me to check the barrel nut and upper first before sending them back the barrel for a check.

    No, sometime this week I'll find time to swap the barrel nut and may just order another .308 upper receiver just to check it against the current one. the upper was purchased used, looks in great shape, with no signs of abuse or defect. The barrel looks centered or evenly spaced from the top to the bottom of the tube (it doesn't lean toward 12 o'clock or 6 o'clock, only leans towards 9'oclock and away from 3 o'clock.)

    Any other suggestions from anyone else is appreciated. I sold my last .308 upper so there is no comparing there and I don't want to break down any of my friend's uppers just to compare. Here's a few pics:





    Any help is appreciated, I want to shoot this thing but want it to be squared away before doing so.
    Last edited by till44; 04-20-2011, 10:14 AM.
  • #2
    Knife Edge
    Senior Member
    • Oct 2010
    • 1355

    The handguard on my Bushmaster Varminter is a bit off, not like that however. Still shoots like a laser beam.

    Comment

    • #3
      HkUSP45
      Senior Member
      • Jan 2006
      • 645

      It seems the upper receiver is faulty. Not straight when they machined the threads for the barrel nut.

      Comment

      • #4
        rareair
        Senior Member
        • Jul 2010
        • 1898

        Post a pic of the entire rifle. I'm contemplating getting a Troy hand guard for my .308 build. Just haven't decided on the MRF or TRX version yet
        MagPul MPLA
        POF-USA P415-18-11T-223
        TROY M7A1
        & a bunch of SIG pistols and rifles

        **WTB P227 TacOps**

        Comment

        • #5
          motorwerks
          Senior Member
          • Nov 2008
          • 1619

          Originally posted by rareair
          Post a pic of the entire rifle. I'm contemplating getting a Troy hand guard for my .308 build. Just haven't decided on the MRF or TRX version yet
          Heres mine...



          I just sent my Troy back too..... see the ny-locks in the picture. BOTH Heli-Coils pulled out. I swear I could have walked it back to troy faster then they shipped it. Anyhow if I hadnt had to ship that back I would have old you whether or not mine did the same thing. I cant honestly remember.

          Comment

          • #6
            Adub
            Member
            • Jul 2008
            • 143

            Motor, what barrel length is that?

            Comment

            • #7
              Nathan Krynn
              Senior Member
              • Oct 2009
              • 2107

              Shooting blind before lunch but I would say the upper. No way to know unless you swap parts one at a time.
              Nathan
              Tactical Machining
              1270 Biscayne Blvd
              Deland, FL 32724
              Phone 386-490-4464
              fax 386-490-4890

              Comment

              • #8
                sonnyt650
                Senior Member
                • Dec 2009
                • 586

                Because of the gas tube I'd think that the handguard wouldn't be designed to be perfectly concentric to the barrel -- that makes for wasted space below the barrel. Towards the receiver is the barrel concentric to the handguard or is it offset from center there too?

                Comment

                • #9
                  motorwerks
                  Senior Member
                  • Nov 2008
                  • 1619

                  Originally posted by Adub
                  Motor, what barrel length is that?
                  18 inch Black Hole Weaponry, with a 13.8 inch tube. I love it!

                  Comment

                  • #10
                    till44
                    Veteran Member
                    • Jan 2008
                    • 2604

                    Originally posted by sonnyt650
                    Because of the gas tube I'd think that the handguard wouldn't be designed to be perfectly concentric to the barrel -- that makes for wasted space below the barrel. Towards the receiver is the barrel concentric to the handguard or is it offset from center there too?
                    It's hard to say, the contours of the barrel make it tough to tell whether it is leaning or not. I'm leaning towrads the cause being the upper itself, only because the rail is new, the barrel nut and barrel extension look good, and I highly doubt the barrel is the problem.

                    The TRX is flush with the upper receiver and the barrel is tightened all the way down, so they should be even at the offset of the two meeting.

                    Comment

                    • #11
                      motorwerks
                      Senior Member
                      • Nov 2008
                      • 1619

                      If you still have the problem with I get mine back you are more then welcome to meet up with me someplace preferably a range between Roseville and Davis/Martinez to swap parts around and try and figure out the problem. Hell if you are willing to swing by Roseville you can ether come to my house or my Range in Lincoln (Lincoln Gun Club). I still have the barrel nut torqued down on the upper so we could just slide it on and check it out if you wanted to try just that.

                      Comment

                      • #12
                        motorwerks
                        Senior Member
                        • Nov 2008
                        • 1619

                        I just had another thought....

                        Could you loosen it up a little and then try and hold it centered or slightly to the 3'oclock position as you tighten it down slowly. I know this seems dumb but maybe? Also careful of how far you tighten it down. Both of my heli-coils pulled through and I wasn't cranking down super hard.

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