Jagged case mouth, ejected 45 ACP brass
Friend has a ARMSCOR / RIA 1911 Compact 45 ACP (4.25" barrel); fairly new, about 250 rounds thru it. Cases eject properly with no indication of any problem, but occasionally (@ 1 in 20 rounds) ejected brass has jagged case mouth, 1/4 to 1/3 around the mouth (appearance is similar to the teeth on a saw). On at least one occasion, this occurred on the last round in the magazine - possibly on more or all instances, but only once identified. Magazine used is whatever the factory provided. No sign of scratches or wear on the firearm. Cartridges are reloads using a recipe which has been used for years in a variety of guns with no problem.