Pistol slide
PART WHICH RECIPROCATES ("SLIDES") WITH RECOIL DURING A GUN'S OPERATING CYCLE; SERVES AS THE BOLT CARRIER GROUP AND PARTLY AS THE RECEIVER
Pistol Slide; Slide (firearms); Gun slide
The slide on the majority of fully/semi-automatic pistols is the upper part that reciprocates ("slides") with recoil during the gun's operating cycle. It serves as the bolt carrier group (BCG) and partly as the receiver, and generally houses the firing pin/striker, the extractor and frequently also the barrel, and provides a mounting platform for iron and optical sights.