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Old June 03, 2020, 17:16   #1
Marshall
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Barrel shimming question

Hi all, first post here. I'm putting together my first FAL, Imbel receiver and an argy parts kit. Barrel timing was winding up around 11 o'clock, so I turned.004 off the shoulder of the barrel. That got me closer so I turned another .003 off and now I'm at about 1 o'clock. I looked up some shims on McMaster, 1" ID, 1.5" OD, .001 thick was as close as I could find. These are stainless. Is this my best option? This is a shooter, not going for a historical safe queen.
Thanks!
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Old June 03, 2020, 17:29   #2
Klaus Von Richter
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Quote:
Originally Posted by Marshall View Post
Hi all, first post here. I'm putting together my first FAL, Imbel receiver and an argy parts kit. Barrel timing was winding up around 11 o'clock, so I turned.004 off the shoulder of the barrel. That got me closer so I turned another .003 off and now I'm at about 1 o'clock. I looked up some shims on McMaster, 1" ID, 1.5" OD, .001 thick was as close as I could find. These are stainless. Is this my best option? This is a shooter, not going for a historical safe queen.
Thanks!
Why would you turn down the shoulder when you were timing at 11 o clock ?
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Old June 03, 2020, 17:30   #3
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Originally Posted by Klaus Von Richter View Post
Why would you turn down the shoulder when you were timing at 11 o clock ?
First thing I thought of.

And now it's severely over timed.
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Old June 03, 2020, 17:35   #4
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So sad when people break out the grinders before doing their research....
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Old June 03, 2020, 17:37   #5
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So sad when people break out the grinders before doing their research....
+1. This is sad.
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Old June 03, 2020, 18:05   #6
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At 11 o’clock, you should have cranked it on.

Gunthings sells shims of varying thicknesses.
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Old June 03, 2020, 18:18   #7
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Old June 03, 2020, 18:32   #8
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Big ooops!Here is an inkling for you - https://www.falfiles.com/forums/show...=barrel+torque

Just don't go doing it again, please. You could get hurt!
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Old June 03, 2020, 19:12   #9
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I should add that I was at 120 pounds on the torque wrench at 11 o'clock. I was worried about stripping out the receiver or the barrel threads. I thought I read 80-120 pounds?
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Old June 03, 2020, 20:05   #10
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Hand tight to golden triangle, around 11 o’clock, then you can crank her to 12.

Last edited by pl521; June 03, 2020 at 20:23.
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Old June 03, 2020, 20:15   #11
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Quote:
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I should add that I was at 120 pounds on the torque wrench at 11 o'clock. I was worried about stripping out the receiver or the barrel threads. I thought I read 80-120 pounds?
There's where the confusion is. We hand time, with bare hands only, by screwing the barrel into the receiver to see where it stops. Hand timed to 11 is ideal, just turn it up from there with proper tools. Actual torque is less important but if you start around 11 it'll have proper torque by the time you screw it up to 12.
Sounds like you timed up way early if you were at 11 and the torque was that high so the shoulder needed relieved. You should have likely stopped after the first .004 and turned it up, hindsight being what it is. Torque ends up whatever it is as long as it will come up to 12 and not be stupid loose or over tightened enough to damage something. I've put what had to be nearly 200 lbft on a barrel with no problems and as little as what must have been close to 70 lbft and it never shot loose.
As you know, now a shim will be required, not the end of the world, the L1A1 was designed that way from the get go.
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Old June 03, 2020, 21:54   #12
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+1 What he said.
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Originally Posted by hkshooter View Post
There's where the confusion is. We hand time, with bare hands only, by screwing the barrel into the receiver to see where it stops. Hand timed to 11 is ideal, just turn it up from there with proper tools. Actual torque is less important but if you start around 11 it'll have proper torque by the time you screw it up to 12.
Sounds like you timed up way early if you were at 11 and the torque was that high so the shoulder needed relieved. You should have likely stopped after the first .004 and turned it up, hindsight being what it is. Torque ends up whatever it is as long as it will come up to 12 and not be stupid loose or over tightened enough to damage something. I've put what had to be nearly 200 lbft on a barrel with no problems and as little as what must have been close to 70 lbft and it never shot loose.
As you know, now a shim will be required, not the end of the world, the L1A1 was designed that way from the get go.
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Old June 03, 2020, 22:20   #13
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so I turned another .003 off and now I'm at about 1 o'clock.
When you say you are at 1 o'clock is that with 120 lb of torque?

Where does it hand tighten to?
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Old June 04, 2020, 04:11   #14
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Yes, I'm at 1 o'clock with at least 120 pounds on the torque wrench. I'll try it again later tonight, but I'm thinking it's going to need at least a .001 shim. Thanks for the help!
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Old June 04, 2020, 07:15   #15
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.001 shims suck. You get one try, and it usually tears - not reuseable. You will need .002" if it hand tightens to 12. .002
" will usually not tear.

Make sure you are not getting a false reading off the chamber face bottoming out.

I sell shims of the correct 1.2" OD.

When you say you took .003" or you took .004" off, you didn't.

If you did, you'd be even more off than you are now. .007"
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Old June 04, 2020, 08:49   #16
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Remove the barrel

Re install with your hands only

When you get the barrel hand tight, take a picture and post it here

If you can't post the picture, send it to me via private message and I'll post it.

Let's find out what the case actually is before commiting to a course of action.
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Old June 04, 2020, 18:43   #17
Marshall
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https://photos.app.goo.gl/vX8yj3PXKwZ8YJeS9
As promised, here are some pictures of the situation. I hope this works, first time trying this. For reference this is HAND tight. As the parts were previous before alteration, it hand tightened to about 10 o'clock.
Thanks again for the help guys.
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Old June 04, 2020, 20:41   #18
sparkeyboaz
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Tilt box

Nice little Klein "tilt box".
I wouldn't trust reading off the top of the sight ears.
It's considerably more reliable and accurate to use a set of barrel "timing rods". The front one will screw into the front sight screw hole. The rear is mounted upright and square to the bottom rear of the upper receiver.
I consider them a must for proper barrel timing!
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