I have a M40A5 clone with a surefire 7.62 brake. I recently purchased a custom .338 Lapua with a surefire .338 brake. I want to use my surefire .338 can on both rifles. Is it as simple as switching the brake on the 7.62 to a .338,or is there machining involved? The part numbers on the brakes are MB338SS02 and MB762SSAL/RE if that helps. Thanks in advance. TJR
Gunsmithing Surefire brake switch questions.
- Thread starter trobertson5-0
- Start date
Re: Surefire brake switch questions.
I am fairly sure you can get a 338 brake threaded in 5/8x24 and just switch the one out on your 308. They should interchange as long as the threads are the same under your current brake.
I am fairly sure you can get a 338 brake threaded in 5/8x24 and just switch the one out on your 308. They should interchange as long as the threads are the same under your current brake.
Re: Surefire brake switch questions.
just enlarge the hole a bit so the 338 can pass through...??
just enlarge the hole a bit so the 338 can pass through...??
Re: Surefire brake switch questions.
It depends on which 7.62 and .338 SureFire brakes you have. I think they make a 5/8-24 7.62 brake, but they dont make that thread pattern for .338 brakes.
To use your .338 brake on your M40, you will have to have the barrel set back and re-profiled for one of the few factory rifle profiles they have listed here - http://www.surefire.com/muzzlebrakeadapter or refer to the matrix above.
7.62 brake - 5/8-24 Threads
.338 brake - 3/4-24 Threads
It depends on which 7.62 and .338 SureFire brakes you have. I think they make a 5/8-24 7.62 brake, but they dont make that thread pattern for .338 brakes.
To use your .338 brake on your M40, you will have to have the barrel set back and re-profiled for one of the few factory rifle profiles they have listed here - http://www.surefire.com/muzzlebrakeadapter or refer to the matrix above.
7.62 brake - 5/8-24 Threads
.338 brake - 3/4-24 Threads
Re: Surefire brake switch questions.
The way I read this post is, you have a Surefire brake on each of your rifles and a can for the 338. If that is correct, I would compare the dimensions on each brake. I would think that if the dimension are the same except the threads, I wouldn't think switching of the brakes is needed. But that's me. If in doubt, call Surefire.
The way I read this post is, you have a Surefire brake on each of your rifles and a can for the 338. If that is correct, I would compare the dimensions on each brake. I would think that if the dimension are the same except the threads, I wouldn't think switching of the brakes is needed. But that's me. If in doubt, call Surefire.
Re: Surefire brake switch questions.
The dimensions on the .338 brake are much larger,so much you don't need to measure it,just look at it. It's the internal dimensions I was wondering about. The above diagram answered that for me! Off to the gunsmith the .308 goes I suppose. So,should I expect to lose some barrel over this.......? Kinda want a 18" rifle anyway.
The dimensions on the .338 brake are much larger,so much you don't need to measure it,just look at it. It's the internal dimensions I was wondering about. The above diagram answered that for me! Off to the gunsmith the .308 goes I suppose. So,should I expect to lose some barrel over this.......? Kinda want a 18" rifle anyway.
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