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Old August 31, 2019, 12:21   #1
Necro_Atrum
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Fal Barrel Undertiming

Hello all.

I'm in the process of building an Imbel kit with a pars receiver. I'm running into trouble timing the barrel. It seem to hand time around the 11 o clock area. My problem arises when I start to torque the barrel. I'm hitting 200 ft lbs before I can get my timing rods lined up. I can get the rods to around 11:30 but again I'm hitting 200 ft lbs at that point.

Here is it hand tight.





Unfortunately I didn't snap a pic to where I was able to tighten the barrel.
I did color in some of the surfaces with a black sharpie and hand tighten it afterwards though.







As far as I can tell the barrel breech face isn't making contact with the receiver.
Where should I go from here? Start sanding?
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Old August 31, 2019, 14:49   #2
hkshooter
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It should twist up from hand tight from there. How do you know you are at 200lbft?
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Old August 31, 2019, 14:52   #3
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I'm using a snap on digital torque wrench. I've been looking around for a max torque range but cant seem to find anything definitive. 200 definitely felt like too much though.
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Old August 31, 2019, 15:14   #4
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A little advice. Those threads look dry. Put some anti seize on them. Also screw a gas nut into the threads and put a charging handle in the slot back wards. Go back and forth with tightening to see if you gain a little. I'm with HK that it should go, but 200 is a lot. I'd use a small file round on one side and flat on the other to just dress up any high spots on the barrel shoulder as it looks like there may be some from the pics. Take it slow

See if you can slip a feeler gauge between the barrel face and the receiver to verify that it's clearing.
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Old August 31, 2019, 16:46   #5
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Alright. Thank you gentlemen. I'm gonna give it another go as soon as I get the chance.
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Old August 31, 2019, 17:31   #6
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Looks like from the pics that you don't have a vise or a press readily available. They are requisite. One time I went to the Jiffy Lube down the street and used theirs. Smeared the flats. No bench with vice is ok. HF has a 12 ton press that is about a buck with a coupon. You don't have to use the bolts on the barrel vise.
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