M1 Garand Barrels and Gas Cylinder Parts. USGI Original and New Criterion Barrels and Gas Cylinders with associated parts. We Stock New Criterion and offer original USGI barrels when available such as Springfield Winchester LMR Harrington & Richardson and National Match. All USGI Barrels do NOT have Import marks and are sold with Throat Erosion (TE) chamber depth and Muzzle Erosion (ME) Gauge readings posted. Headspace should be checked by a competent Gunsmith as we can't vouch for your bolts or receivers. * Historical Note: most WWII barrels gauged as high as 2.75 TE when NEW with the majority just around 1.75. TE of a new production SA barrel during World War II ran anywhere from approximately 1.0 to 3.5. Pre World War II SA barrels were usually in the 0.0 to 1.0 range. Winchester barrels were generally in the -1.0 to 2.0 range new.