Conversion basics: what “caliber conversion” means for your rifle A caliber conversion replaces or adapts the barrel, bolt/slide, magazine, or complete upper assembly, allowing a firearm to accept and fire a different cartridge. Conversions range from simple drop-in barrels and recoil/slide assemblies to complete upper swaps that change the operating pressures, magazine geometry, and feeding … Continue reading Rifle Caliber Conversions: Glock, 1911 & AR-15