The 2.25”x2.25” patches are typically the best fit for the popular 9mm, .38 caliber and .357 caliber bores, as well as .40 and .45 calibers. However, the 2.5” x 2.5” patch is commonly used in .45 caliber barrels. Most pistols fall under this size range.But though not common, the 6mm barrel perfectly
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