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Many times I have been asked why somebody would test a Brand New M1 Garand barrel only to find the gage indicates 1 to 3, indicating wear. This is a common occurence that was addressed in an article from The Ordnance Sergeant from 1943. Sometime in 1942 all .30 and .50 caliber barrels were redesigned to insert the throat a 135 thousandths of an inch deeper. The reason was GI's were ejecting live cartridges only to find the bullet stuck in the rifling, leaving powder all through the action. In the Browning Machine Guns, this could disable the guns until broken down and cleaned.

Note the article mentions both the 03 and M1 Throat Erosion Gage (referred to by part numbers) but the title eroneously lists only the 03.

THIS DOES NOT APPLY TO THE LATER M14 THROAT EROSION GAGE WHICH IS CALIBRATED FOR A CHROMED BORE


 
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