10/22 8.5" barrel problem

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CNADNSL8-5

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I finally took my 10/22 to the range. The 8.5 barrel I got from fabsports has a hole in the top about an inch forward of the receiver that is drilled and tapped. I did not think much about it till I went shooting. The hole actually goes all the way into the bore. :confused: The powder and gasses blow out the hole when firing. Is this supposed to be that way? What size thread/screw fits the hole? (fab is away so he isn't answering email at the moment)
 
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Wow that sounds weird, there is the scope mounts that go on the barrel but I thought there were two screws on that.

If it is the same as the receiver it would be 6-48.
 
My groups seemed off, but since it was the first time with the new barrel and new scope I figured it just neede to be dialed in. I never noticed the build up of powder on the under side of the scope till 150+ rounds later. I forgot to loctite the rail screws (stupid me) and noticed the scope wiggling and then saw the powder on the scope. :(
 
I have the same barrel and the hole in mine also goes right through. :eek: Maybe its for a gas port. :p. Probably not since its so far back. Oh well.:confused: Maybe a set screw and some Loctite would fix it up as I sure don't want gases shooting through that hole unannounced. I haven't actually used it yet as I was waiting for my MP5 project to get underway and I would install it then. It shouldn't affect groups though as I didn't see any burrs in the barrel itself, so I'm not really worried about it. I also didn't expect that barrel to be a match grade barrel so "spray and pray" type shooting would be the order of today.
 
10/22 is blowback operated, so no need for a gas port. Sounds like the machinist who drilled that hole (probably for a scope mount hole) went too far.

I'd send it back to exchange it for a new barrel.
 
Mr AR15 said:
I have the same barrel and the hole in mine also goes right through. :eek: Maybe its for a gas port. :p. Probably not since its so far back. Oh well.:confused: Maybe a set screw and some Loctite would fix it up as I sure don't want gases shooting through that hole unannounced. I haven't actually used it yet as I was waiting for my MP5 project to get underway and I would install it then. It shouldn't affect groups though as I didn't see any burrs in the barrel itself, so I'm not really worried about it. I also didn't expect that barrel to be a match grade barrel so "spray and pray" type shooting would be the order of today.
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I hope its as accurate in looks as the thompson. So far, no one has come close to the MP5 look.


sillymike said:
Wait for Fabrice to come back... I'm sure he'll take care of the problem.
The hole isn't suppose to go all the way trough.
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I have complete confidence he will take care of it.
 
sillymike said:
Fab,

We know the hole if for the krinker kit... the problem with CNADNSL8-5 is that the hole goes all the way through the barrel!
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70 % are like this it's why I put a screw when I sell these barrels, may be I am out of stock of bolt when I sell this barrel but it's not hard to find
 
If you are worried that it will affect performance -don't. Lots of barrels have holes in them for blowback systems such as the AR-15 and the M1 Garand to name a few. This particular hole is located just ahead of the chamber so it won't have any impact on the bullet assuming that you put a set screw back in with some Loctite. Use a 1/8" long #8-32 set screw and you'll be ready to rock and roll:dancingbanana:.

John
 
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