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M14 Gas System Shim Set

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Product Description

M14 Gas System Shim Set


Accurize your M14 by adjusting & tightening your gas system

Set of 3 shims for the M14/M1A gas system.  Consists of .005, .010 and .020 stainless steel precision shims. 

By using these in combination, you can cover a complete rotation of the gas cylinder lock in .005 (about 1/6 turn) increments. 

USGI gas cylinder/cylinder lock/front band combos usually shim tight at .020-.025. 

These mount between the barrel shoulder and the front band. 300 Series Stainless Steel.


If you're only ordering the shims and would like it sent by letter mail for less than the $14 flat rate, just give us a call after you place your order!


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Product Reviews

  1. Great product, great shipping option 5 Star Review

    Posted by on 16th Jul 2018

    I called and asked for the lettermail option, which only added a couple of dollars for mailing. Second shim I tried worked perfectly to bring my Navy sight into alignment.

    Very glad HiCal had these available and at a good price.

  2. perfect fit 5 Star Review

    Posted by on 27th Jun 2018

    great upgrade for my m305b fit great easy to install..

  3. exactly what was needed 5 Star Review

    Posted by on 23rd Mar 2018

    after installing the .005 shim the gas block tightened up perfectly. Great service and shipping time. Thanks guys and maybe gals.

  4. expensive but does the job 3 Star Review

    Posted by on 4th Apr 2017

    With shipping/taxes these things cost me 40$ but I am extremely satisfied in how effective they are in shimming the gas block on my m1a.

  5. exactly what I was looking for 5 Star Review

    Posted by on 24th Mar 2017

    hard to find ind part for my Norinco m305. All shims measure n at 1/2 a thou over the measurement listed with my Canadian Tire micrometer; since all measured the same variation I suspect the micrometer not being calibrated. with the 0.005 shim my m305 shorty gas tube tightened right to spec

  6. Hard to find M14 parts 4 Star Review

    Posted by on 14th Aug 2016

    I needed shim for the gas system for my recently purchased M305/M14. There are not too many sites within Canada that you can order part for this weapon platform. I intend to be ordering more parts from this site. Thanks for everything.

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