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Old December 04, 2017, 15:12   #1
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Remove a broken bit from gas port?

I was adjusting the gas port on my PARA, and broke a bit off in the port. It is 7/64 or .107, there is maybe 1\4" stuck. It is below the top of the bottom hole in the gas block , but not through to the bore.

And good advice on getting it out would be greatly appreciated.
Thanks.
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Old December 04, 2017, 15:33   #2
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Remove the block if you can't get the drill bit end to come loose. And that's only if the bit hasn't gone into the barrel enough to keep the block from coming off.
By removing the block, you'll have better access to the bit from the barrel side of the hole.
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Old December 04, 2017, 15:47   #3
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Unfortunately the bit is just proud enough that it won't come off. Also the gas block on this rifle is particularly tight, i had to use a press to remove it when i shortened the barrel.
This FAL is being particularly stuborn, in many ways.
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Old December 04, 2017, 15:49   #4
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Might try a strait seal pic, but I'd advise caution so you don't break it's tip off as well. If you can get the bit to come loose, it may come out when you invert the barrel.
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Old December 04, 2017, 16:13   #5
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Yep, that's why GP says use cobalt. You can shatter it. What a mess. Maybe some snap ring pliers to see if you can jiggle it? Maybe a couple of rounds down the barrel to blow it free?
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Old December 04, 2017, 16:19   #6
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Use a pinch to drive it out. Place a wooden dowel in barrel to protect it.
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Old December 04, 2017, 16:45   #7
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No bore obstruction.....correct? Chamber a round and fire it.....wear eye protection.....it "should" blow out.....
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Old December 04, 2017, 16:55   #8
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Quote:
Originally Posted by nwobhm View Post
No bore obstruction.....correct? Chamber a round and fire it.....wear eye protection.....it "should" blow out.....
LOL I thought about that. I might give it a try. Its the least invasive thing.
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Old December 04, 2017, 17:06   #9
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I seriously doubt you'll blow it out by shooting a round down the barrel. Bits break when they get too big of a bite of the steel, for one reason or another. The cutting edge of the bit is buried in steel now. It would only blow out if it can wiggle (loose), and even then it's doubtful.
Call around to machine shops and ask if they have a fast hole burner for burning out broken taps, drill bits, bolts, etc., and have they blast it out. Shouldn't take but a few minutes to do.


I have to ask, why did you remove the gas block to shorten the barrel?
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Old December 04, 2017, 17:11   #10
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50K PSI is a lot of pressure.
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Old December 04, 2017, 17:43   #11
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Quote:
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50K PSI is a lot of pressure.
Yes it is a lot of pressure, but the period of time when it's that pressure, is the time when the bullet passes the gas port, until it leaves the barrel. Milliseconds!

I say try it. Get back to us with the results.
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Old December 04, 2017, 18:02   #12
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Quote:
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Yes it is a lot of pressure, but the period of time when it's that pressure, is the time when the bullet passes the gas port, until it leaves the barrel. Milliseconds!

I say try it. Get back to us with the results.
I know but watching that piston snatch that carrier and send it damn near all the way back against the recoil spring force...I didn't know a machine shop would burn them out without charging a arm and a leg though.
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Old December 04, 2017, 18:17   #13
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Man, I've done it a time or two, which is why I only use carbide or cobalt now. I was able to hammer a HSS out but gouged the gas block journal badly. Cobalt or carbide, air hammer the block off with an angle iron between the regulator and barrel, and it (usually) shears off. Will sometimes deform the HG screw hole, but that's soft and can be swaged back to shape with a tapered pin.
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Old December 04, 2017, 18:18   #14
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Quote:
Originally Posted by nwobhm View Post
No bore obstruction.....correct? Chamber a round and fire it.....wear eye protection.....it "should" blow out.....
Did that once. Worked great.
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Old December 04, 2017, 20:03   #15
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I removed the block for lathe use, shorten and rethreading

Quote:
Originally Posted by idsubgun View Post
I seriously doubt you'll blow it out by shooting a round down the barrel. Bits break when they get too big of a bite of the steel, for one reason or another. The cutting edge of the bit is buried in steel now. It would only blow out if it can wiggle (loose), and even then it's doubtful.
Call around to machine shops and ask if they have a fast hole burner for burning out broken taps, drill bits, bolts, etc., and have they blast it out. Shouldn't take but a few minutes to do.


I have to ask, why did you remove the gas block to shorten the barrel?
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Old December 04, 2017, 20:05   #16
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No machine shops around me want to touch fierarm stuff, I've asked for other stuff before.
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Old December 04, 2017, 20:34   #17
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Put it in the Freezer for a couple days, might work, might not, won't hurt. Did it many winters ago on a 1903 Springer receiver. Bought carbon bits right after.
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Old December 04, 2017, 20:50   #18
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After you freeze it what is the end game hear? I'm not sure I understand the method, i can't punch it through because it hasn't broke through to the bore yet.


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Put it in the Freezer for a couple days, might work, might not, won't hurt. Did it many winters ago on a 1903 Springer receiver. Bought carbon bits right after.
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Old December 04, 2017, 21:21   #19
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Bugger, just re-read your original post and see that you are indeed in deep doo-doo there.
In my case I was able to get hold of the tiny end by grinding down a pair of Needle Nose pliers. It didn't budge until I froze it. One metal shrinking more than the other at low temp I would guess.

In your situation, rapping on the barrel with a Brass/Lead Hammer might dislodge it after the Freezer treatment.

A more drastic operation would be micro diamond bits in a Dremel if you've a keen eye and a steady hand. I have neither anymore.
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Old December 05, 2017, 09:22   #20
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Drill a hole underneath and drive it out from below with a hammer and punch......... No ? I'm seeing a new barrel in your future

Seriously, I feel for you. I've busted bits on other projects that were "easier" to fix, and they weren't fun. Hope you can get it out by firing it. Let us know how it goes, please !

Good luck !
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Old December 05, 2017, 09:35   #21
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Between work and kiddos, I've got to wait until Sunday before I can shoot it. I'll cross my fingers until then.
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Old December 05, 2017, 09:38   #22
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Between work and kiddos, I've got to wait until Sunday before I can shoot it. I'll cross my fingers until then.
Just walk out the back door and let er rip
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Old December 05, 2017, 09:45   #23
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I used to be able to do that
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Just walk out the back door and let er rip
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Old December 05, 2017, 18:21   #24
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find a way to get hands on frozen nitro. drill will shrink and hole will expand. can you weld an extension on to the drill? I'm basically asking if it is protruding beyond the block? welding and then cooling might get it to shrink considerably so you can remove it.
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Old December 05, 2017, 18:56   #25
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find a way to get hands on frozen nitro. drill will shrink and hole will expand. can you weld an extension on to the drill? I'm basically asking if it is protruding beyond the block? welding and then cooling might get it to shrink considerably so you can remove it.
It is probably halfway down the hole in the block, not sure how much is in the barrel. I think it broke when it caught the port in the barrel.
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Old December 05, 2017, 19:03   #26
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I used to be able to do that
Just messing with ya. I can do it here but would screw the can on.
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Old December 05, 2017, 21:50   #27
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Cut it out with inexpensive dental bur


https://www.ebay.com/itm/Dental-Carb...-/302177601822
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Old December 05, 2017, 22:05   #28
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Those are way to short, and I do have ready access to some. I started on it with some dremel diamonds, I had to turn the shanks way down to fit through the top hole. The Dremel ones are barely long enough when chucked up at max length. Going to try and shoot it out at the first chance I get.

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Cut it out with inexpensive dental bur


https://www.ebay.com/itm/Dental-Carb...-/302177601822
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Old December 10, 2017, 20:53   #29
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Got out to the range.
Shooting the rifle worked like a charm.
I put some small diameter tubing in the gas block, with a cut out at the bottom.
My idea as to cushion the impact of the bit,and prevent damage to the gas block.
One round and the bit was gone. Pulled the tubing and there was nice dent in it.
Very happy this worked.

Thanks for all the advice.
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Old December 11, 2017, 04:55   #30
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Old December 11, 2017, 06:32   #31
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Nice. Great save!
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Old December 11, 2017, 07:47   #32
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Thanks for report back - very good future reference.
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Old December 11, 2017, 11:41   #33
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Good deal! I've seen bits stuck that needed an act of God to remove so I doubted it would work but glad it did.

Now if I ever make the same mistake, I'll have to try it.

It'd be my luck as I racked the bolt into battery the drill bit would slip down into the barrel, creating a blockage. And then I'd burst my barrel! lol
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Old December 12, 2017, 14:44   #34
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Maybe use a blank firing device and a blank? All the bang, nothing moving down the barrel in case it is protruding into the projo's path.
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