Doe's threading barrel & installing a flash hider affect accuracy negatively?

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Hey Gunnuterz, does anybody know from testing or practical experience that having a barrel threaded and a flash hider or other device (ie, muzzle brake) installed, create a negative affect on accuracy,,,
Thanks in advance for your input:)
 
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Uhh, I think you need to delineate between your crown and the end of your barrel.

Damaging the crown does damage accuracy. Threading the exterior of a barrel to allow for a muzzle device, if done properly, should leave the crown unaffected.

Will your muzzle device affect accuracy? Most that I know of don't. But I know lots of US guys that say their suppressor produces tighter groups.
 
TV-PressPass said:
Uhh, I think you need to delineate between your crown and the end of your barrel.

Damaging the crown does damage accuracy. Threading the exterior of a barrel to allow for a muzzle device, if done properly, should leave the crown unaffected.

Will your muzzle device affect accuracy? Most that I know of don't. But I know lots of US guys that say their suppressor produces tighter groups.
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Thanks for the quick reply TV PressPass I will change my post to say barrel and not crown and thanks for your input on the subject too, I had read somewhere that any change to or pressure on a barrel may affect accuracy (negatively) and that's why I asked,,,
 
General consensus appears to be that it depends on the muzzle device attached and that if you want absolute best accuracy a well crowned barrel is best. Some flash hiders have been reported to increase accuracy, but the consensus appears to be not to mess around if it is a big concern of yours.
 
removing material from the external surface of a barrel affects internal dimensions. so threading a muzzle will affect bore dimensions not a lot but some. This may or may not hurt accuracy. I didn't believe this for a long time, my lack of belief has no affect on the facts. If you have a zinger of a barrel then threading it is taking a risk of loosing a bit of accuracy.
 
dizzy said:
removing material from the external surface of a barrel affects internal dimensions. so threading a muzzle will affect bore dimensions not a lot but some. This may or may not hurt accuracy. I didn't believe this for a long time, my lack of belief has no affect on the facts. If you have a zinger of a barrel then threading it is taking a risk of loosing a bit of accuracy.
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I had thought that any external changes or pressures to a barrel would affect the internal aspects of it there by changing the accuracy even if only slightly,,,
Thanks for replying Mirk and dizzy
 
I think if there was an accuracy change it would be on the precision benchrest scale.

How would threading a barrel affect the internal dimensions, dizzy? Do you mean dimensions as a measure of space, or some other use of the word?
I could understand if it affects the harmonics and rigidity of the barrel, especially if you remove a substantial amount of material, as that section of the barrel will be less stiff and thus possibly introduce a "whipping" motion to the tip of the barrel as that section flexes out of time with the rest of the barrel.

Someone somewhere must have done research on this issue, but I don't know where or who.

Give RatedRR, from youtube, a call. He's got a fancy slow motion camera that could let us see if barrel threading really affects the flex of the barrel.

Some external pressures can result in an increase in accuracy, such as with some Ruger rifles that use upwards pressure on the barrel at the end of the forestock.
 
steve bot. it has to do with metalurgy and im no expert. i just listen to the experts and any who are any good will tell you that turning a barrel afects internal dimensions. that is one of the main reasons anschutz leaves a hump on the muzzle of their finest barrels. i believe it opens up the bore a bit
 
i have no experience with threading a barrel but i do know that pinning a flash hider on a mini fourteen that i used to own definitely improved accuracy . as to the why, i have no idea .
 
Cutting the threads on for a muzzle device can affect the concentricity of the bore, you are reducing the OD of the barrel, and if not done correctly it can exert pressure that can deform the bore.

More of an issue (providing the threads etc are done correctly) is how the Muzzle Device is manufactured, and how it is affixed.
Most A2 muzzle devices are bulk made and have rather sloppy tolerances. These can actually affect accuracy as the disruption on the gasses as they overtake the bullet upon exiting the muzzle.

However the bigger issue is often in how the muzzle device is affixed. You typically want a minimum amount of torque, as any threaded item can kick over a bit when a lot of torque is applied, as well as the torque is forcing the muzzle device to apply (often uneven) pressure on the muzzle end of the barrel.

15-20ft/lbs of torque is the most I would recommend - and if you are concerned about the muzzle device coming loose - then use rockset.
 
Muzzle Swells as Dizzy mentioned have been added to large bore systems for a while (WWII) when the M1 105 Howitzer did not have a muzzle swell and the thin muzzle was often ovalling at the end, the muzzle swell was added to give additional mass that would not deform in as few rounds.

More modern example is - our earlier SR-25 threaded muzzle guns (circe 92-95) used 5/8-24 muzzle threading, we found that the barrels often shot out earlier than non threaded muzzled due to ovalling at the crown, we then changed to 3/4-24 muzzle devices to ensure enough material at the end of the muzzle.
 
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