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Recrown Muzzle? |
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BER911
Grunt Joined: Aug 04 2018 Location: Central VA Status: Offline Points: 314 |
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Posted: May 27 2019 at 11:13am |
I was looking at the Fulton Armory website and noticed on their page listing Gunsmithing services something called "Recrowning Muzzle". I am not familiar with that term. Could someone explain what "recrowning" is and the benefit of doing it to a M1 Carbine.
Thanks.
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Semper Fi, Bruce
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1st M1 88
On Point Joined: Aug 26 2016 Location: illinois Status: Offline Points: 278 |
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The muzzle end of the barrel is the last thing that touches the bullet and any nick will affect accuracy. Crowning the barrels muzzle insures that is square to the bore. Probably more technical terms but that is my understanding.
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BER911
Grunt Joined: Aug 04 2018 Location: Central VA Status: Offline Points: 314 |
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Thanks, that's very helpful.
So for example, if a carbine measures Muzzle Erosion of 2.5, recrowning should bring it back to a measurement of 0. Is that correct? |
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Semper Fi, Bruce
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1st M1 88
On Point Joined: Aug 26 2016 Location: illinois Status: Offline Points: 278 |
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Crowning does not repair a worn barrel, it will repair damage to the crown of the barrel. Some crowns are nicked from cleaning equipment and this nick can be the very last thing that touches the bullet as it leaves the barrel and affect the bullets flight. I shot service rifle competition and nicked the crown of my M1A. My groups started to open up with fliers. I sent it off to Springfield armory thinking the bedding might be the cause. Springfield informed me the crown was nicked and re-crowned the barrel. Groups were back to where they were before I damaged the crown. Lesson learned. Bore guide cleaning from muzzle end a must.
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2949 |
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Bruce, Here is a pretty interesting article about rifle crowns and accuracy.
https://rifleshooter.com/2018/03/do-rifle-crowns-matter-does-a-crown-effect-accuracy/ |
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Wayne
USMC Retired NRA Life Member |
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1st M1 88
On Point Joined: Aug 26 2016 Location: illinois Status: Offline Points: 278 |
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Thanks for the link W5USMC. Read it and found it to be very informative. I also have a better understanding.
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Charles
Grunt Joined: Mar 21 2016 Location: Maryland Status: Offline Points: 587 |
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DO NOT USE A STEEL CLEANING ROD. Use either a brass rod or a corded "pull from the breech" cleaning out fit.
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Charles
Co B 1st Batl.115 Inf. Reg. 29th. Divi. 4.2 Heavy Mortar Co Retired Life member NRA |
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BER911
Grunt Joined: Aug 04 2018 Location: Central VA Status: Offline Points: 314 |
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Wayne - thanks for the article; it was an interesting read. My take away is muzzle erosion does not affect accuracy as much as I thought it might.
Charles - very good point! I use a cleaning rod made of carbon fiber. Unfortunately, the damage I want to correct was done over the last 75 years by people using the USGI steel cleaning rods. |
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Semper Fi, Bruce
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BER911
Grunt Joined: Aug 04 2018 Location: Central VA Status: Offline Points: 314 |
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I had my local armor re-crown the barrel of my "new" Inland carbine. The barrel's crown was pitted and and had a few "bumps and scrapes" when I bought it. Regrettably, I failed to take any pictures of the original damaged crown. I do have a couple of pictures that show the re-crowned barrel after the armor performed his magic.
I have cleaned the barrel and front sight to remove all the remaining metal flakes since I took these pictures. I am very pleased with the results and the renewed appearance of my barrel. |
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Semper Fi, Bruce
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2949 |
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Nice Bruce, looks like he did a pretty good job.
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Wayne
USMC Retired NRA Life Member |
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Donnie
On Point Joined: May 31 2018 Location: Newburgh, IN Status: Offline Points: 335 |
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Ber911, that crown looks great. What did your smith charge you for that work?
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BER911
Grunt Joined: Aug 04 2018 Location: Central VA Status: Offline Points: 314 |
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Thanks for the kind words gents!
Donnie - David (armor) re-crowned the barrel and reset/aligned the rear sight. The rear sight was lose in the dovetail when I bought it; I could slide it side-to-side with my fingers. David charged me $100 total for both repairs. It was money well spent in my opinion. |
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Semper Fi, Bruce
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