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Muzzle Devices for 13.7" Barrel

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  • #46
    SigSauerP226
    CGN/CGSSA Contributor
    CGN Contributor
    • Sep 2007
    • 876

    Believe there are quite a few prong flash hiders that are close to or longer than 3 inches. I believe this is the one that won the flashider shootout twice and it's a little over 3 inches:

    https://www.jprifles.com/buy.php?item=JPFH-556L Apparently you'd have to order elsewhere, their website says they don't ship to CA

    In Muzzle Brake Shootouts Part 1 and Part 2, we were primarily testing recoil reduction performance. With something like 64 brakes and comps recoil tested, it was time to move onto muzzle flash. For this shootout we were able to gather 33 different muzzle devices — mostly dedicated flash hiders but also some hybrid units ... Read more


    As a follow-up to the AR-15 Flash Hider Shootout, test #2 here adds a variety of new flash hiders to the mix and also includes a lot of combination devices and even some straight-up brakes and comps. So, yes, for the pedants out there this is a “flash hiding” test, not a “flash hider” test. We ... Read more
    Last edited by SigSauerP226; 06-04-2020, 3:35 PM.

    Comment

    • #47
      ar15barrels
      I need a LIFE!!
      • Jan 2006
      • 57124

      Originally posted by SigSauerP226
      The useful things in those articles are these:


      Randall Rausch

      AR work: www.ar15barrels.com
      Bolt actions: www.700barrels.com
      Foreign Semi Autos: www.akbarrels.com
      Barrel, sight and trigger work on most pistols and shotguns.
      Most work performed while-you-wait.

      Comment

      • #48
        Jaybird
        Senior Member
        • Jul 2012
        • 1145

        Keep it NOVESKE and throw the Flaming Pig on it. Don’t overthink it.

        Comment

        • #49
          Mute
          Calguns Addict
          • Oct 2005
          • 8557

          Agree. If you just need a flash hider, might as well just go KX3 or KX5.
          NRA Benefactor Life Member
          NRA Certified Pistol, Rifle, Personal Protection In The Home, Personal Protection Outside The Home Instructor, CA DOJ Certified CCW Instructor, RSO


          American Marksman Training Group
          Visit our American Marksman Facebook Page

          Comment

          • #50
            tg97
            Junior Member
            • Mar 2020
            • 81

            Originally posted by Mute
            Agree. If you just need a flash hider, might as well just go KX3 or KX5.
            This might sound stupid but...I don't know if I'm a fan of that look. You guys like the look of the KX3/KX5? I feel like from aesthetics point of view, you need a slightly longer hand guard to pull it off.

            Called up SOL and they told me about the NOX so that's what I got. I'll test fit and measure and if that doesn't work, then I guess I'll have to consider the KX3

            Comment

            • #51
              ar15barrels
              I need a LIFE!!
              • Jan 2006
              • 57124

              Originally posted by tg97
              Called up SOL and they told me about the NOX so that's what I got.
              I cut down a barrel and perm attached a NOX today.
              The barrel ended up at about 13.85" and at about 16.1" with the NOX and some shims perm attached.
              The NOX measured 2.9" long.
              You should be able to pass 16" with maybe 1/16" of spacers on your barrel.
              Randall Rausch

              AR work: www.ar15barrels.com
              Bolt actions: www.700barrels.com
              Foreign Semi Autos: www.akbarrels.com
              Barrel, sight and trigger work on most pistols and shotguns.
              Most work performed while-you-wait.

              Comment

              • #52
                Mute
                Calguns Addict
                • Oct 2005
                • 8557

                Originally posted by tg97
                This might sound stupid but...I don't know if I'm a fan of that look. You guys like the look of the KX3/KX5? I feel like from aesthetics point of view, you need a slightly longer hand guard to pull it off.

                Called up SOL and they told me about the NOX so that's what I got. I'll test fit and measure and if that doesn't work, then I guess I'll have to consider the KX3
                Understandable. Not everyone likes the look. And I agree it looks best with a handguard that is long enough to cover the barrel entirely or even partially over the FH (like with the KX5). Glad you found something. The NOX should be cool.
                NRA Benefactor Life Member
                NRA Certified Pistol, Rifle, Personal Protection In The Home, Personal Protection Outside The Home Instructor, CA DOJ Certified CCW Instructor, RSO


                American Marksman Training Group
                Visit our American Marksman Facebook Page

                Comment

                • #53
                  tg97
                  Junior Member
                  • Mar 2020
                  • 81

                  Originally posted by Mute
                  Agree. If you just need a flash hider, might as well just go KX3 or KX5.
                  Originally posted by ar15barrels
                  I cut down a barrel and perm attached a NOX today.
                  The barrel ended up at about 13.85" and at about 16.1" with the NOX and some shims perm attached.
                  The NOX measured 2.9" long.
                  You should be able to pass 16" with maybe 1/16" of spacers on your barrel.
                  Sounds good Randall, NOX coming in Monday. Hopefully you can give me a little discount to help me out with gas and squeeze me in for next week haha

                  Comment

                  • #54
                    tg97
                    Junior Member
                    • Mar 2020
                    • 81

                    Thanks for everyone's input! As a new rifle owner, really appreciate all you guy's help

                    Comment

                    • #55
                      Robert1234
                      Veteran Member
                      • Aug 2006
                      • 3078

                      Originally posted by SigSauerP226
                      Believe there are quite a few prong flash hiders that are close to or longer than 3 inches. I believe this is the one that won the flashider shootout twice and it's a little over 3 inches:

                      https://www.jprifles.com/buy.php?item=JPFH-556L Apparently you'd have to order elsewhere, their website says they don't ship to CA

                      In Muzzle Brake Shootouts Part 1 and Part 2, we were primarily testing recoil reduction performance. With something like 64 brakes and comps recoil tested, it was time to move onto muzzle flash. For this shootout we were able to gather 33 different muzzle devices — mostly dedicated flash hiders but also some hybrid units ... Read more


                      https://www.thetruthaboutguns.com/ar...hiding-test-2/
                      The JP flash hider is impressive, almost all flash hidden.

                      Comment

                      • #56
                        code_blue
                        Veteran Member
                        • Sep 2012
                        • 3452

                        I understand the intent is to go as short as you legally can with an P&W, but I've found that using a 14" flat bbl will allow more muzzle device options while still meeting the bare min bbl requirement. IIRC, BA makes a 14.0" bbl in a few configurations.
                        Classifieds:

                        Radian & Aero Pistol lowers, Folsom

                        Comment

                        • #57
                          H3nchman
                          Member
                          • Sep 2012
                          • 391



                          Here you go.
                          13.7"
                          -.63"
                          Plus 0.25"
                          Plus a SF muzzle device at 2.7"
                          16.02"
                          Don't fight a battle if you don't gain anything by winning.
                          ~Erwin Rommel

                          Comment

                          • #58
                            ar15barrels
                            I need a LIFE!!
                            • Jan 2006
                            • 57124

                            Originally posted by H3nchman
                            https://adcofirearms.com/shop/catego...es/kac-spacer/

                            Here you go.
                            13.7"
                            -.63"
                            Plus 0.25"
                            Plus a SF muzzle device at 2.7"
                            16.02"
                            Woah!
                            1/4" of spacer and the 1/10" thread counterbore on a surefire brake leaves you maybe 5 threads holding the muzzle device.
                            The engineers will tell us that 3 threads is all you need, but I still think it's not ideal.
                            I have had a few barrels through my shop where 2 threads were holding the brake and it blew off in use.
                            Randall Rausch

                            AR work: www.ar15barrels.com
                            Bolt actions: www.700barrels.com
                            Foreign Semi Autos: www.akbarrels.com
                            Barrel, sight and trigger work on most pistols and shotguns.
                            Most work performed while-you-wait.

                            Comment

                            • #59
                              H3nchman
                              Member
                              • Sep 2012
                              • 391

                              Originally posted by ar15barrels
                              Woah!
                              1/4" of spacer and the 1/10" thread counterbore on a surefire brake leaves you maybe 5 threads holding the muzzle device.
                              The engineers will tell us that 3 threads is all you need, but I still think it's not ideal.
                              I have had a few barrels through my shop where 2 threads were holding the brake and it blew off in use.

                              Interesting. Thanks Randall. I don't have any experience with doing that. I just saw it recommended as a way to get a surefire device on a 13.7 inch barrel. I don't think it's ideal.
                              Don't fight a battle if you don't gain anything by winning.
                              ~Erwin Rommel

                              Comment

                              • #60
                                ar15barrels
                                I need a LIFE!!
                                • Jan 2006
                                • 57124

                                Originally posted by H3nchman
                                Interesting. Thanks Randall.
                                I don't have any experience with doing that.
                                I just saw it recommended as a way to get a surefire device on a 13.7 inch barrel.
                                I don't think it's ideal.
                                You can put a big spacer behind a muzzle device when the muzzle device does not have a big counterbore or chamfer in the threads.
                                The chamfer removes a few threads from the brake so that the brake can thread all the way back on a barrel which does NOT have the last few threads against the shoulder.
                                Surefire has a significant chamfer.
                                KAC does not have such chamfer.
                                That's why that spacer is made for a KAC.

                                When you COMBINE a brake with a big thread chamfer with a spacer that pushes the brake away from the barrel shoulder, you are removing more and more threads of engagement.
                                The Surefire brake's chamfer removes about 3 threads, similar to a crush washer.
                                A normal A2 flash hider WITH a crush washer or a Surefire with minimal alignment shims will have around 14 threads of engagement.
                                1/4" spacer is taking away 7 threads of engagement.
                                Then you need some clocking shims to align which would take away another one, leaving you 5-6 threads.
                                The engineers say that 3 threads is absolute minimum for a threaded junction but most designers want twice the screw diameter of engagement length.
                                Of course we don't have 1" of screw engagement on ANY 1/2-28 threaded AR barrel since the usable threads are only 1/2" long after the crush washer.
                                Randall Rausch

                                AR work: www.ar15barrels.com
                                Bolt actions: www.700barrels.com
                                Foreign Semi Autos: www.akbarrels.com
                                Barrel, sight and trigger work on most pistols and shotguns.
                                Most work performed while-you-wait.

                                Comment

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