The 1911A1 I received from CMP has absolutely no markings on the slide. In almost 60 years of playing with military 1911s (including 21 USMC) I haven’t seen a slide without a manufacturers’ name on it. Nor is there any other etching/stamping on it. CMP says it is a Remington Rand slide. The frame is Ithaca. And is not unusual for an Army frame. Is this common for a Remington Rand slide?