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Posted: 2/3/2015 3:28:55 PM EDT
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I recently put a CNC adaptor to 5/8x24 on my M92 and added a Surefire 7.62 brake on it. Before doing so the gun always shot POA at 100 yards without any muzzle device at all. Now though, the gun shoots 2' high at 30 yards with most bullets hitting the paper completely vertically. I inspected the gun and see some brass marks on the bottom of the inside of the last "baffle" in the brake. I suspect the threading is not concentric to the barrel.
Now, I have hopes to suppress this in the near future, and obviously don't want to ruin a new can. The threads on these are part of the FSB, not the barrel itself. What would you guys recommend doing to fix this? Can a gunsmith make the threads concentric? Or would I need them to mill off the FSB threads so they have enough space to thread the barrel directly? Would that be an issue with figuring out how much shoulder space to leave on the barrel, or is that a pretty standard procedure? If anyone has some suggestions I am all ears, as well if anyone has some ballpark costs I am looking at to get this to shoot straight. I am not opposed to having the barrel threaded directly. If anything I won't need the CNC warrior adapter adding another inch of length to the gun. Thanks guys. |
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Originally Posted By Yaakattack3:
I am not dead set on using the FSB threads by any means. Would having those milled off to allow enough space to have the barrel itself threaded be my best bet then? How much am I looking at to get this done? I bet that could be made to work threading directly to the barrel. Before doing anything I would put a call in to your silencer's manufacturer and see how short of barrel length they will warranty. Let me post a picture of what I did to get my AK74 threaded properly. I'll pull it out when I get home from work and snap a pic. |
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Originally Posted By ShaggyAnt:
I bet that could be made to work threading directly to the barrel. Before doing anything I would put a call in to your silencer's manufacturer and see how short of barrel length they will warranty. Let me post a picture of what I did to get my AK74 threaded properly. I'll pull it out when I get home from work and snap a pic. Originally Posted By ShaggyAnt:
Originally Posted By Yaakattack3:
I am not dead set on using the FSB threads by any means. Would having those milled off to allow enough space to have the barrel itself threaded be my best bet then? How much am I looking at to get this done? I bet that could be made to work threading directly to the barrel. Before doing anything I would put a call in to your silencer's manufacturer and see how short of barrel length they will warranty. Let me post a picture of what I did to get my AK74 threaded properly. I'll pull it out when I get home from work and snap a pic. Thanks for doing that. Can't wait to see a pic. I don't know which suppressors will warranty on a barrel of 10 inches. |
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I found you a thread to look at from another forum.
http://www.akfiles.com/forums/showthread.php?t=212132 I'll still send pics of my gun. It's slightly different than this one. |
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Originally Posted By Yaakattack3:
Ok so similar process at that link. A major difference being I would be cutting away the threads on the FSB completely and threading the barrel itself rather than threading the FSB, correct? The pics I linked is probably what you will want to do in this case. On my AK74 I slid the front sight back about 3/4" and put the threads on the barrel. It worked out to where I was still able to put the factory muzzle brake back on over the threaded area. I'm thinking that moving the sight back won't work because yours is a combo gas block / front sight and it will throw everything off. |
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the problem is you are going from a front sight base thread that may or may not be co-centric to the muzzle to another thread to the suppressor. You basically have stacked two tolerances (and thus associated looseness) with the adapter on top of the possibility of the front sight base thread not being co-centric to begin with.
Using a thread adapter is, in my personal opinion, a terrible way to mount a suppressor. My suggestions is get the threaded portion of the front sight base removed and the barrel itself threaded and then mount the suppressor that way. If you want to put an original type muzzle booster on for looks that is where you can use a thread adapter - the bore hole of the original muzzle booster is larger and a lot closer to the muzzle face so is much more forgiving of any "slop" |
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