In this Tech Tip, Brownells gun tech Steve Ostrem discusses the reasons a muzzle needs re-crowned or chamfered and how to complete the project at home using Brownells products. Learn more here www.brownellsvideos.com
I have a 1980s AR-15 from an extremely well known Connecticut manufacturer that I was going to use a suppressor on. After removing the flash hider, I was utterly flabbergasted to see the muzzle crowned off center from the bore axis. I had always been perplexed that the rifle grouped poorly with all ammo types and as a result, it was my least favorite rifle to shoot. I ordered the Brownells 11 degree chamfer tools and some Tap Magic cutting fluid and re-crowned the muzzle. Point of impact shifted 4 MOA and groups shrunk to about 1 MOA with some ammo producing sub MOA. Now this is one of my favorite ARs with a factory carry handle. Thank you Brownells!
You guys have great videos. I've started to remember a lot of things my Grandfather told me as a kid about re-crowing barrels and other things. His brother owned a machine shop and used to modify a lot of firearms for hunters and the police. I was unaware that re-crowning was a process I could do myself. Thanks.
Thank you! I have a M1 Garand to re-crown, since the Muzzle Grade is a 3 and with dings, it is all over the grid. I'll be getting this from you guys soon.
Think of it this way... the LAST thing the bullet touches before leaving the rifle is the bore at the muzzle. An imperfection there (more than any other place in the barrel) affects accuracy. Even a microscopic flaw at the bore / muzzle causes the bullet to deflect off course. A good recessed crown by a proficient gunsmith is CRITICAL to a rifle's inherent accuracy. SSG. U.S. Army (Medically Retired) Infantry / Sniper / SOF Intel (SOT-A), multiple tours
@@DJChrisArgueta GREAT! My Arsenal SAM7 is more accurate than ever, shooting dime size group at a 100 yards. The muzzle and thread finally are concentric to the bore now so I can run my suppressor on it without fear of a baffle strike.
drill press and some make shift tools you can turn some brass down . or just make a clay mold and poor it ,,, then polish it up in the drill. / be just as good as anything they put out, save some $ , there's junk brass all over this country its just knowing where to look for its .. out door plumming mostly/
I would be a proponent of just a simple file-down (3:05). The outside contour of the barrel edge wouldn't affect projectile exit much anyway. Besides, I would not want to risk a screw-up of the inner chamfer/crown.
Are there radius tools for an octagonal barrel or would this one work? I am building a muzzle loader and would love to chamfer the corners of the barrel. I like the chamfered look much better than the plain square all the way across look.
I just cut and crowned a barrel on my personal.22lr, my second year gunsmithing, I plan on cutting to 90 and putting threads on later, but my crown is good, I already reblued the barrel, but on one spot it's not quite perfect. As long as my crown is and it shoots straight would it be ok to leave a little spot a few degrees off....
Haha, yeah in a lot of places this is a felony, in others you have to ask permission half a year in advance and pay a $200 tax (and ask the government for permission way in advance every time you cross state lines) just to repair your old barrel. I’m sure our founders who executed their politicians for much less would pay that $200 on top of their tea tax right before blowing off some heads with their newly shortened sawed off musket. But you can’t even legally repair your barrel in many states so even paying the tax and putting your name on the dog execution list isn’t legal to comply with the game of tyranny.
@@mmpiforall5913 For what they were doing, it shouldn't matter as long as it is held steady. The brass polishing piece for the crown is radiused on the end so the angle isn't critical.
david carter you must have had it muted he said "if damaged beyond repair" for instance if you buy a gun that someone managed to bend the barrel on or if the first few inches of rifling are ducked or counter bored (the glorious nosin nagant is in mind when I say that I bought one to sporterize and someone hit it with a hack saw and then threw a break on it and called it a day)
I bought a HBAR barrel from brownells a few years ago and it has never shot below 2”. I’m a manual machinist I have thought about throwing the barrel in the lathe and re-crowning the barrel. Is it possible it would improve accuracy in that type barrel or is that not much more than I should expect
Definitely would if done correctly.Look on YT for recrowning using a brass screw in a drill,(softer than the barrel steel) using some auto valve polishing paste .Simples.
I am amazed that the barrel steel is so soft! The hand chamfer and a hacksaw blade cut through it like butter. That’s amazing to me. I would think barrel steel would be somewhat hardened. I’ll have to admit, I do not look at my Browning BAR with as much respect as I did before. And where is the proof that Muzzle profiling is not just for aesthetic’s, anyway??
Barrel steel is most definitely hardened, it's just that the cutting tools are made from harder steel than the barrel. Barrels aren't super hard like the cutting tools because containing tens of thousands of pounds of pressure is not exactly safe with brittle steel lol. Using lubricants like cutting oil helps smooth things out a lot too.
Como se fabricar um estrumento para fabricar araiamento em canos de rifle ou melhor um tutorial sobre este assunto de araiamento ok um abraço do amigo do brasil j LIMA
Michael Lea and Daughter used to modify those vises. I am unable to find current information about these folks. They were in Columbus, OH. Good people! You might find a used one if you are really lucky, but most people are going to be unwilling to part with one. The modified version is much better than the unmodified. The original jaws were cut off and replaced with heavy angle iron with wood pads glued to them. I found one picture of the new jaws.
Only caveat about cutting down a barrel....do not cut below 16"! Most 16" barrels are actually 16 1/4" just to be sure it doesn't get below that sinful 16"....
Using a hack saw to cut off the end of a barrel?? Many barrels are already at minimum legal length, check out what's allowed in your state or you may be in legal jeopardy! Brownells needs to proof read the script!!
Please do not cut your muzzle this way. It will seriously ruin your barrel. This video is only meant to sell products. The only way to get a precise crown is turning on a large
For a long range precision target rifle ...yes not the best idea. For a hunting rifle that needs repair to be able to hold at least 1 1/4 m.o.a. or better at 100 yards....this works just fine.
