CMP Armorer Explains Garand Headspacing Procedures
Garand matches are among the most popular and well-attended of the CMP competition disciplines. When obtained directly from the CMP, Garands are fun to shoot and affordable. However, with these classic battle rifles, you need to ensure that the headspace is set properly to ensure safe function and good brass life.
In the archives of The FIRST SHOT, the CMP’s online magazine, CMP Armorer John McLean has written an excellent article entitled: “Everything You Ever Wanted to Know about Checking M1 Garand Head Space.” We recommend all Garand shooters read the article.
McClean explains: “Excessive headspace will cause the brass to stretch more than it should and increases the likelihood of a case failure. Insufficient headspace may contribute to slam fires, light strikes on primers, misfires and more wear on parts due to the additional force needed to chamber the rounds.”
Garand Head Space Gauges
McClean writes: “Both Forster and Clymer make fine gauges but we have found that there are differences between the two companies’ gauges that make the Clymer gauges best for use with the M1. The headspace that the original manufacturers of the M1 considered correct can be determined by checking new or nearly new rifles that we have here at CMP. With that information we have determined that Springfield Armory and the other manufacturers of the M1 used gauges that were very close to the Clymer dimensions… and therefore we use, and recommend using only the Clymer gauges.”
How to Check for Proper Headspace
In the article, McClean goes on to show how to properly use the “GO”, “NO GO”, and “FIELD” gauges. You’ll want to read the Complete Article. One of the important points McClean makes is that the ejector can affect headspace reading. Accordingly, “the bolt must be disassembled and the ejector removed, or clearance notches must be made on the headspace gauges so there will be no contact between the headspace gauges and the ejector.”
CLICK HERE to read COMPLETE ARTICLE….
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1. I understand that the Foster gadges are not as exacting as the Clymer gages for headspace in the M-1. Fulton Armory is selling all three foster Gadges for $71.00. I am thinking I should get the Clymer go and no go gadges from CMP. Does that sound right to you?
2. The sticker on my m-1 from CMP says I have a chamber and throat of 2 and 2. That sounds like I have a pretty good gun barrel. Does that sound right to you?
Thank You
Mike Benjamin PSC USCG Ret.