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Muzzle thread integrity Q

dantiff2

About 18/20 years ago, I had a guy thread a Rem 700 (30-06) barrel for a muzzle brake. (back story) He was learning to become a gunsmith and just wanted some work to learn on. I didn't need a brake but the work was free and I only paid for the brake. If anything was wrong, or bad happened we were on the same page that I wouldn't have any money involved for repairs. Fast forward. I have gotten into suppressors and most all of my stuff is threaded. I never even thought about this old 06' until recently. I was cleaning it and pulled the brake off to clean it, and the muzzle and noticed that he never chopped off the last couple inches of the barrel. So my 1/2x28 threads run right over top of the two factory, front sight holes (8x32 or whatever they are). Does anyone think that the integrity of the muzzle threads are compromised? I'm really afraid of blowing my suppressor off of the barrel and ruining it since it's a 30 caliber with 1/2x28 threads. I doubt there is any material below the front sight blind holes. I'm worried about it cracking with the weight of the suppressor hanging off and the added stress of the forces involved with using a can on the muzzle. Am I over thinking this?
Dan
 
DaveTooley said:
I wouldn't worry about. Plenty of steel left and muzzle pressures are much lower than peak pressure.
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Thanks Dave ; )
Would it be standard procedure to thread over top of holes like that? I would have rather had about two inches taken off to end up with a nice clean thread like I see on all of my other barrels. Maybe he was afraid to cut the barrel?
 
Not standard procedure but I would have asked you about shortening the barrel before I started the work. Maybe all he had was a hacksaw to cut it off. That's what I used for a few years when I started. I think he was concerned about screwing it up so the less he did the better.
 
DaveTooley said:
Not standard procedure but I would have asked you about shortening the barrel before I started the work. Maybe all he had was a hacksaw to cut it off. That's what I used for a few years when I started. I think he was concerned about screwing it up so the less he did the better.
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Yes, I agree. Knowing now what I do and having other threaded barrels, I would have known to ask him to remove the end of the muzzle before doing the work. Judging by my calibrated eyeball, I'm in awe that the factory front sight holes aren't breaking through into the bore of this rifle. My calculations come up with about a .010" thou buffer. Guess that would not be an issue with a screw installed but it makes me really hesitant to put something with 14oz of weight on the end.
 
It’s funny how in the old days out west we wouldn’t think of shortening a barrel - we wanted all the performance we could get and everyone I shot and hunted with would demand a new barrel if the gunsmith sawed a few inches off. I sold off a perfectly good 7 mag because the barrel was only 23”. Now, everyone with a can wants a 20” 7 mag - makes no sense to me.
 
Countrycustoms said:
Just check it with an alignment rod and make sure it'll clear.
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No worries. Triple checked and all was perfect. Put thirty rounds through the 06’ yesterday (with the can on) and was more than ecstatic with the results! Needless to say, the muzzle break will be in the parts bin from here on out. POI shifted slighty (as expected) but accuracy was spot on after a small adjustment. My 15 yo son was busting 2” gongs (moa) at 200 yards. He was smiles the whole time and never wants to shoot it with the brake again
 
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dantiff2 said:
No worries. Triple checked and all was perfect. Put thirty rounds through the 06’ yesterday (with the can on) and was more than ecstatic with the results! Needless to say, the muzzle break will be in the parts bin from here on out. POI shifted slighty (as expected) but accuracy was spot on after a small adjustment. My 15 yo son was busting 2” gongs (moa) at 200 yards. He was smiles the whole time and never wants to shoot it with the brake again
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Ya, just about everybody that makes the switch never looks back. It'd be great if regulation would loosen up on them.
 
dantiff2 said:
No worries. Triple checked and all was perfect. Put thirty rounds through the 06’ yesterday (with the can on) and was more than ecstatic with the results! Needless to say, the muzzle break will be in the parts bin from here on out. POI shifted slighty (as expected) but accuracy was spot on after a small adjustment. My 15 yo son was busting 2” gongs (moa) at 200 yards. He was smiles the whole time and never wants to shoot it with the brake again
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Those suppressors will just spoil you ;)
 
Riesel said:
Those suppressors will just spoil you ;)
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Yeah, tell me about it! Even my wife and kids enjoy them vs shooting without. They should be an over the counter purchase and at a fraction of the price they retail for today. Everyone needs to advocate for this!!
 
Only for a future reference, a muzzle thread minor depth should be .040 deep VS the major thread diameter. In the situation of a 1/2 x 28 you have a .500 stub less .040 per side or .080 total. Many factory lighter weight barrel contours do not have a muzzles diameter that enables a full cut to get to .625 to make a 5/8 x 24 thread
 
Steel Mover said:
Only for a future reference, a muzzle thread minor depth should be .040 deep VS the major thread diameter. In the situation of a 1/2 x 28 you have a .500 stub less .040 per side or .080 total. Many factory lighter weight barrel contours do not have a muzzles diameter that enables a full cut to get to .625 to make a 5/8 x 24 thread
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Thread depth is pitch dependent. A class 2a 1/2-28 tpi thread has a minor of .457.
An 8 pitch is deeper than a 32 tpi, for example. Maybe I misunderstood your post.
 
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Steel Mover said:
Only for a future reference, a muzzle thread minor depth should be .040 deep VS the major thread diameter. In the situation of a 1/2 x 28 you have a .500 stub less .040 per side or .080 total. Many factory lighter weight barrel contours do not have a muzzles diameter that enables a full cut to get to .625 to make a 5/8 x 24 thread
Click to expand...
Thread depth has nothing to do with diameter. It's pitch dependent. 28tpi has a different minor than 24tpi.
Typically you want your shoulder diameter to be .1" over your thread major for suppressor use. That's where your muzzle diameter really comes into play. Even if you don't have enough O.D. there are ways around it.
 
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