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old11bravo
Site Supporter
Location: Everett Joined: Mon Apr 22, 2013 Posts: 3421
Real Name: Ron
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Well I think I may have finally figured out why I’m not getting the consistency and/or accuracy out of my Mega Maten AR10 build. I was blaming it on a bad Mega barrel until recently. I was removing the muzzle brake because I wanted to try something different and I discovered this! It looks like a crusty carbon build up has been deposited on the inside of the brake threads. I tried cleaning/removing this metallic concrete type of cruddy build up out of the threads but nothing I’ve done so far has been successful. I believe this build up occurred because I used a jamb nut to secure the brake to the muzzle of the barrel rather than threading the brake all the way on to the muzzle until it seated flush against the crown of the barrel. The jamb nut effectively left a void section of threads on the inside of the brake. Anyway, that is my theory. Please see the pictures below and tell me what you think. QUESTIONS.....?Do you think this deposit occurred because the brake wasn’t seated flush with the crown of the barrel (due to using a jamb nut)? Do you think this crud build up is significant enough to affect and diminish the accuracy of the barrel? I noticed some of the carbon crud build up on the crown as well. The picture shows a lot of fibers from the cloth I wiped it with so please disregard those. Does the crown of the barrel look like it will be okay for me to install a new brake? Anyone have any ideas for methods, products or tools that would remove the carbon crud build up seen in the pictures? I’ve always held the Mega brand in high regard but became very disappointed with this barrel sometime last summer. It started out satisfactory enough but I wouldn’t consider it satisfactory now. The specs on the barrel are listed below the pictures. Mega 308 Barrel – 18 - $310 ($294.50) • Manufactured under the strict supervision of Mega Arms. • Chambered in .308 Winchester • Machined with a Medium Contour. • 1:10 twist for accurate overall performance. • 5/8-24 threaded muzzle. • .750 diameter gas block seat. • SR-25/DPMS pattern barrel extension. • 11° target crown. • Uses standard AR-15 Mid Length Gas system. • GUARANTEED TO SHOOT SUB 1 MOA @ 100 YARDS WITH MATCH AMMO!! • Made from 416 Stainless Steel • Finished in Black Nitride Coating • Weight 44.4 oz
Last edited by old11bravo on Sun May 06, 2018 5:08 pm, edited 1 time in total.
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Sun May 06, 2018 4:58 pm |
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os2firefox
Site Supporter
Location: Everett, WA Joined: Sat Aug 4, 2012 Posts: 2798
Real Name: Snek on de ladder
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Have you shot it without the compensator? If the accuracy/precision any different?
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Sun May 06, 2018 5:03 pm |
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Sinus211
Site Moderator
Location: Marysville Joined: Thu Mar 22, 2012 Posts: 13502
Real Name: Mike
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Give me the brake tomorrow. I'll take it home and run it in the ultrasonic cleaner overnight. Should remove the build up.
_________________Licensed/Bonded/Insured Hardwood Floor Installer/Finisher http://www.hardwoodfloorsnw.com/
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Sun May 06, 2018 5:29 pm |
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Yondering
Site Supporter
Location: Skagit County, in the woods Joined: Tue Apr 7, 2015 Posts: 1058
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I don't think that small amount of crud buildup has anything to do with the accuracy of that system; I've seen much worse on rifles that shoot very well. Naturally fouling like that will build up in any gap like that between a muzzle and brake or flash hider; a common A2 birdcage is one example, but it will take many thousands of rounds (if ever) for the fouling to build up to the point of hurting accuracy.
One possibility for your accuracy problem though might be the jam nut. You should always install a brake against the barrel shoulder or the muzzle, not against a nut like that. The nut can allow the brake to be inconcentric with the bore, and that can definitely affect accuracy.
If that were mine, I'd clean the brake threads out with a 5/8"-24 tap, but without that you'll have to use a pick of some sort to reach in there and scrape it out of the threads. You could try soaking it in something like Kroil or Hoppes #9 for a few days, but I doubt you'll find anything to actually dissolve that stuff. The muzzle needs a cleaning but looks fine otherwise; I'd try some OO steel wool under your thumb, just rotated against the muzzle.
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Sun May 06, 2018 5:30 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52020
Real Name: Steve
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Meh. That looks fine to me.
I would try shooting it without the brake, though, to see if accuracy is better. If it is, then you have a starting point.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Sun May 06, 2018 5:35 pm |
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jukk0u
Site Supporter
Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21255
Real Name: Vick Lagina
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It's the palsy you old fracker!
_________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith
"The said Constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams
“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli
Láodòng zhèng zhūwèi zìyóu
FJB
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Sun May 06, 2018 5:44 pm |
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old11bravo
Site Supporter
Location: Everett Joined: Mon Apr 22, 2013 Posts: 3421
Real Name: Ron
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sinus211 wrote: Give me the brake tomorrow. I'll take it home and run it in the ultrasonic cleaner overnight. Should remove the build up. Done! I'll have your grip too. Yondering wrote: I don't think that small amount of crud buildup has anything to do with the accuracy of that system; I've seen much worse on rifles that shoot very well. Naturally fouling like that will build up in any gap like that between a muzzle and brake or flash hider; a common A2 birdcage is one example, but it will take many thousands of rounds (if ever) for the fouling to build up to the point of hurting accuracy.
One possibility for your accuracy problem though might be the jam nut. You should always install a brake against the barrel shoulder or the muzzle, not against a nut like that. The nut can allow the brake to be inconcentric with the bore, and that can definitely affect accuracy.
If that were mine, I'd clean the brake threads out with a 5/8"-24 tap, but without that you'll have to use a pick of some sort to reach in there and scrape it out of the threads. You could try soaking it in something like Kroil or Hoppes #9 for a few days, but I doubt you'll find anything to actually dissolve that stuff. The muzzle needs a cleaning but looks fine otherwise; I'd try some OO steel wool under your thumb, just rotated against the muzzle. Thank you! I will try these suggestions. MadPick wrote: Meh. That looks fine to me.
I would try shooting it without the brake, though, to see if accuracy is better. If it is, then you have a starting point. Another great idea. Half the battle (or maybe more) is finding out where to start. jukk0u wrote: It's the palsy you old fracker! Haha lol! I'm still trying to figure out how you got your typewriter to transcribe to the internet.
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Sun May 06, 2018 6:07 pm |
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Normanator
Site Supporter
Location: Shelton, WA Joined: Sat Dec 17, 2011 Posts: 1134
Real Name: Norm
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I'm certainly no expert, and others here are more versed than me on ARs, but that metal build up looks copper colored, almost like pieces of jacket have been hitting it. Now that could just be copper fouling from the muzzle I suppose. What's the purpose of not seating the brake fully? Seems they were designed to be used threaded all the way on, but I'm not familiar with that particular model, so maybe not?
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Sun May 06, 2018 6:21 pm |
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waglocker
Location: Ohio Joined: Fri Nov 9, 2012 Posts: 3924
Real Name: Sean
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Why did you use a jam nut? Are the threads inside of the muzzle brake not long enough to allow the muzzle brake to seat fully against the shoulder of the barrel's muzzle end?
I have the same barrel on an AR10 build with zero accuracy issues, but I did use the PWS FSC30 muzzle brake on it. It uses shims to time the brake to the barrel. From what I remember there is plenty of thread inside that brake.
Sorry you are having issues with yours.
_________________ United States Army, Retired. 2001 - 2023
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Sun May 06, 2018 7:34 pm |
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Yondering
Site Supporter
Location: Skagit County, in the woods Joined: Tue Apr 7, 2015 Posts: 1058
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Normanator wrote: I'm certainly no expert, and others here are more versed than me on ARs, but that metal build up looks copper colored, almost like pieces of jacket have been hitting it. Now that could just be copper fouling from the muzzle I suppose. What's the purpose of not seating the brake fully? Seems they were designed to be used threaded all the way on, but I'm not familiar with that particular model, so maybe not? It's common to have some copper in the fouling in/around muzzle devices. Mostly you'll see it show up as blue corrosion. That brake doesn't look to me like it would index on the muzzle (threaded section appears too deep in the pics). You should be able to time it to the barrel with shims, as waglocker said. I'm assuming timing is why you used a jam nut; that's acceptable with a flash hider (bigger hole for the bullet to pass through) but not with a brake.
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Sun May 06, 2018 9:08 pm |
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Powderman
Location: WA State Joined: Fri Feb 8, 2013 Posts: 658
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Quick question...what ammo are you using?
_________________ I hunt the things that go bump in the night....
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Sun May 06, 2018 9:11 pm |
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BadKarma
Site Moderator
Location: Duvall Joined: Tue Sep 13, 2011 Posts: 8660
Real Name: Jaime
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Have you consider it might be the operator head space and timing? Drink water, change your socks.
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Mon May 07, 2018 5:02 am |
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RocketScott
Site Supporter
Location: Kentucky Joined: Fri Jan 16, 2015 Posts: 11082
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Yondering wrote: One possibility for your accuracy problem though might be the jam nut. You should always install a brake against the barrel shoulder or the muzzle, not against a nut like that. The nut can allow the brake to be inconcentric with the bore, and that can definitely affect accuracy. ... That right there. Get a set of shims and install the FH correctly.
_________________ You may be right, I may be crazy, but it just may be a lunatic you're looking for
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Mon May 07, 2018 6:57 am |
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old11bravo
Site Supporter
Location: Everett Joined: Mon Apr 22, 2013 Posts: 3421
Real Name: Ron
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RocketScott wrote: Yondering wrote: One possibility for your accuracy problem though might be the jam nut. You should always install a brake against the barrel shoulder or the muzzle, not against a nut like that. The nut can allow the brake to be inconcentric with the bore, and that can definitely affect accuracy. ... That right there. Get a set of shims and install the FH correctly. Gonna try shooting without a muzzle device first but when I do re-install the muzzle device you can rest assured that I'm done with the jamb nut method. BadKarma wrote: Have you consider it might be the operator head space and timing? Drink water, change your socks. Haha lol, yes this has been considered.......... and not completely discounted as of yet. Thank you for your valuable input.
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Mon May 07, 2018 1:14 pm |
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PMB
In Memoriam
Joined: Wed Mar 6, 2013 Posts: 12018
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jukk0u wrote: It's the palsy you old fracker! So much helpful advice here on WaGuns...
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Mon May 07, 2018 1:21 pm |
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