REALLY? :O
The crown is THE single most important part of the barrel when it comes to accuracy.
Screwed up my T81 rifling........how bad is it?
- Thread starter HawkWei
- Start date
REALLY? :O
The crown is THE single most important part of the barrel when it comes to accuracy.
ABSOLUTELY DO NOT DO THIS !!!!!!!!!!!!!!
Loosening up the bore in an asymmetric way right at the muzzle will completely destroy any hope of accuracy. Go too far and the rifle would be lucky to hit the side of a barn at 100 yds .... and I'm not really kidding about that.
The OP has three choices here: Have the barrel shortened and recrowned to remove the damaged portion ... as long as that would not put the barrel below restricted length. Recess the crown to remove the damaged portion. Leave it alone and let the bullets smooth the damage out as much as they are going to.
#3 he saw some guy on YouTube do it. I watched that vid last night.
IF I were going to do such a thing I'd turn myself a custom brass mandrel rather than trying to use a steel screw. One interesting thing the YouTube vid didn't mention was the sleeve is a bearing fit onto the barrel and heating the sleeve as well as adding some lube inside the thing would allow it to come off way easier.
Lastly, the YouTube vid guy said he was gonna sand the inside of the bearing fit sleeve to allow it to be removed more easily in the future ... without considering that sanding a bearing fit surface will make it rough and taking too much material off the inside of the sleeve will make it fit loosely, which will cause it to rattle and destroy the barrel harmonics and any possible accuracy potential.
See people, ignorance can hurt you ... or at least cost you a lot of money.
When I worked for a gunsmith shop, a guy brought in a VZ58 to get a new barrel. He had gotten a bore snake stuck and then ripped the end off, and then jammed a wood dowel into the bore to try to push the bore snake out which he snapped off, which led him to hammer a steel cleaning rod in to push out the wood dowel and bore snake, which resulted in the steel cleaning rod becoming irrevocably stuck in the barrel deeply enough it was impossible to grab w tooling and damaged the threads so a section couldn't be screwed on to lengthen it.
The lesson here is that when you make one mistake, ####ING STOP and seek professional help. One stupid home fix after another just makes things worse until you have an expensive rifle that will cost more to fix than to simply throw in the garbage and get a new one .... which is what our guy above ended up doing.
OP, you either live with the barrel as is or you consult a gunsmith to have the crown counterbored. Continuing down the rabbit hole with any one of the ridiculous suggestions found in this thread will just make things worse.
tactical lever
CGN frequent flyer
- Location
- Fox Creek, Alberta
Not a safety concern. By the end of the barrel the pressure is much lower than the chamber, and the scratches won't even be blip on the pressure scale as far as safety. Likely it will affect accuracy as it will scrape off a little slice of jacket as it passes.
I'm not a gunsmith, but what I'd likely do is get a bullet or maybe a few in an empty case in a drill, and smooth it out with some valve lapping compound.
You'll be removing material so go slow, and keep it centered. You shouldn't have to do too much.
As long as it's smooth and fairly even, it will maintain accuracy.
Put a patch or two up the barrel before starting to keep the junk out of the rest of the barrel, chamber and action.
If that doesn't work, likely a gunsmith won't charge too much to clean it up.
I'm not a gunsmith, but what I'd likely do is get a bullet or maybe a few in an empty case in a drill, and smooth it out with some valve lapping compound.
You'll be removing material so go slow, and keep it centered. You shouldn't have to do too much.
As long as it's smooth and fairly even, it will maintain accuracy.
Put a patch or two up the barrel before starting to keep the junk out of the rest of the barrel, chamber and action.
If that doesn't work, likely a gunsmith won't charge too much to clean it up.
I would try a wooden dowel sized when a fine grit 500 wrapped around and snug fit in barrel, just lap in and out a couple times no further than the scratches and shoot it, yes its a big deal but maybe not so much, failing that I would chuck in lathe and cut the barrel down to remove the scratches
first rule never ever use anything in a bore of any gun that is harder than brass
first rule never ever use anything in a bore of any gun that is harder than brass
Does your pick catch IN the gouges or at the edge of them? if nothing is sitting proud I wouldn't think much more about it after running a brass brush to knock anything loose off.
Anybody cut & ream the sleeve so the bayonet fits properly? maybe with a threaded barrel and muzzle device?
Anybody cut & ream the sleeve so the bayonet fits properly? maybe with a threaded barrel and muzzle device?
Hi guys I screwed up big time when trying to remove the T81 barrel sleeve.
I was following online tutorial where you inserted a tape wrapped screw into the barrel and using gear puller to pull the sleeve out.
The whole process was very smooth until.....after the removel I inspect the barrel and I found some scratch damge.
The screw was not 100% straight under gear puller's pressure and part of my barrel was scratched as result.
I know, I was a damn fool and should have checked more often during the process!
The scratch can be felt by pick, and will caught a bit cotton using q-tip.
My question is:
1. How bad is the damage? Is it a critical safety concern or it is just might affect accuracy?
2. Can Gunsmith help to sand the scratch down?
Cheers!
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http s://rifleshooter.com/2018/03/do-rifle-crowns-matter-does-a-crown-effect-accuracy/
Feel better. Less of a deal than one might think
Interesting read.
Looking at the pic, it seems the crown itself (transition from bore to bbl end) was not damaged at all. The damage is limited to the rifling just inside the crown.
I have said numerous times in this thread the OP should absolutely leave the barrel alone and refrain from trying to remove any nicks / gouges via sanding or any other method, other than back boring the crown deeper into the barrel. Sanding away the rifling just before the crown will surely destroy any hope of accuracy as the bullet will slowly be freed from the grip of the rifling and allow gas to pass before the bullet exits. There would be no way to ensure this effect was evenly distributed around the bore.
boss351cleveland
CGN frequent flyer
- Location
- Down by the river
More people screwing up their guns to try to make them look like something else or AKs, like a gun fashion show.. Never got this lol the T81 looks super cool in its original form, better than a AK in my opinion, it was made to work better too, and replaced the AK in china . Maybe everyone just has AR withdraw, that's the best rife to screw with .. Down south they wish they could get these T81 rifles but cant cause of their 922r import regulations , and the few there sell for a fortune, they would be shocked to see what we do to them .. They already have collector value and could go up more over the years , just look at the SKS and mosins now. lol i used to buy them for $99 not all that long ago .
The coolest thing about the T81 is the sleeve and then people see some youtube videos how to remove it and are thinking "very good idea".
Honestly, you had it coming, don't mess with your firearms unless you know what you are doing.
I remember 2 years ago it was "in" to improve the trigger of the SKS. That was funny, so many WTB ads later for a trigger group.
Enjoy the rust forming due to moisture caught between the sleeve and your barrel. Literally every single sleeve I've pulled off has been hiding a huge rust spot.
p.Rundle
CGN frequent flyer
Do not do anything yourself at this point. You are in damage control mode, which means a professional should take over and limit the extent of the damage. Have a good gunsmith cut a new, deep crown and thread the barrel (which I suspect you wanted given your removal of the GL attachment). Whatever you do, do not sand anything.
Only my opinion, but when it comes to the guts of a moderately expensive rifle, it's worth it to just pay a gunsmith to do the big jobs like this.
Only my opinion, but when it comes to the guts of a moderately expensive rifle, it's worth it to just pay a gunsmith to do the big jobs like this.
I don't know that the GL sleeve is "the coolest thing" about the T81 but you are not wrong about the rest of it.
The more important question is, "Why can't we get dummy rifle grenades to launch off our T81's?"
