Does This Rifle Need to Be Shimmed? No Play! - M14 Forum

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Does This Rifle Need to Be Shimmed? No Play!

This is a discussion on Does This Rifle Need to Be Shimmed? No Play! within the Accuracy forums, part of the M14 M1A Forum category; I recently purchased a Socom CQB and I disassembled it yesterday in order to give it a 'once over'. I was going to add a ...


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Old May 18th, 2017, 10:28 AM   #1
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Does This Rifle Need to Be Shimmed? No Play!

I recently purchased a Socom CQB and I disassembled it yesterday in order to give it a 'once over'.

I was going to add a shim to the Front Band, but immediately noticed that there was Zero play in it.

Should I leave it alone? There doesn't appear to be any play, so would the Shim help at all?

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Old May 18th, 2017, 10:42 AM   #2
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Define "play"
rotational or fore and aft?

Shims are used to get the gas cylinder lock to time correctly and remove any fore and aft play.

Peening the splines is used to remove any rotational play.

pg

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Old May 18th, 2017, 11:17 AM   #3
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find a 1/16 allen wrench or drill and stick it in the gas cylinder hole and see if it lines up with the barrel hole.that will tell you if you need to shim.

watch tony ben videos to see

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Old May 18th, 2017, 11:31 AM   #4
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No.

Shoot it first. The pounding on the gas plug will pull the cylinder forward against the lock. Then check to see if the front band rattles.

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Old May 18th, 2017, 11:32 AM   #5
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How does it shoot like it is?

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Old May 18th, 2017, 11:48 AM   #6
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Check gas cylinder hole if it is aligned then take it to the range and put some copper in that barrel. Then see what play you have. Make sure to grease the rifle according to the teachings of "Tony Ben the Wise"

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Old May 29th, 2017, 08:46 AM   #7
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Well ... after 440 round through the rifle ... there is still not any play in the Front Band.

I'm thinking that maybe I lucked out on this one.

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Old May 29th, 2017, 07:21 PM   #8
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KYMountainMan, if it ain't broke, don't fix it! I know that is hard for a redneck, but don't!

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Old June 19th, 2017, 08:15 PM   #9
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my scout i bought shims without checking and turns out the lock goes to the perfect position in original without shims

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Old June 19th, 2017, 10:03 PM   #10
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As others have reported, my M1A standard had a perfectly timed lock --5:30 position.

I bought $10 worth of shims and never used them.
I got really lucky with my overall rifle though. Shoots like a dream.

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Old June 20th, 2017, 09:25 AM   #11
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While the use of shims does not hurt anything if properly installed, it's my considered opinion that shims are unnecessary on standard issue type rifles. Rifles with unitized gas systems have no need for shims at all. I have yet to find a M14 rifle that exhibited excessive gas port misalignment when the gas lock was indexed. That is the result of the gas port being larger in the gas cylinder than that found in the barrel. However, those of us who build National Match rifles do try to use gas locks that time hand tight to about 4:30 or 5 o'clock. This helps eliminate any movement of the gas system when firing. It's more of a simple case of checking all the boxes. I do install shims when the customer requests them. They do more for the operators head space than benefiting the rifle.

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