The Weyland-Yutani88 Mod 4 Combat Pistol, also known simply as the Combat Pistol, is an 18-round, blowback-operated, striker-fired, double action only, semi-automatic pistol chambered in 9×19mm Parabellum. Made completely of nano-bound hard impact plastic and other synthetic materials, its design was nearly identical to that of the Heckler & Koch VP70, a pistol in service at approximately the same time as the 88 Mode 4.
The 88 Mod 4 uses a spring-loaded striker instead of a conventional firing pin. It is double action only so the trigger pull is relatively heavy. In lieu of a blade front sight, the 88 Mod 4 uses a polished ramp with a central notch in the middle to provide the illusion of a dark front post. The 88 Mod 4 uses a manual safety and is the circular button located immediately behind the trigger and is a crossblock safety.
C43 Extended Magazine: "Large capacity pistol magazine created from lightweight plastics; lightweight composition allows each magazine to hold more ammunition without adding significant weight."
S91 Dot Reflex Sight: "Non-magnifying reflector sight outfitted with a red LED dot; LED dot remains consistently positioned, allowing for faster target acquisition."
Full-Auto Action Replacement: "Heavily modified firing mechanisms throughout the 88 Mod 4 allow conversion from semi-automatic to fully-automatic fire."
In-game "Mod" and "4" are not separated when the pistol's name is in all capitals.
In the Brady Games Aliens: Colonial Marines Guide, the 88 Mod 4 is the only weapon whose title is not in bold.
Also in the Brady Games guide, despite it being referred to as the "88 Mod 4" in Firing Range (the 88 Mod 4 displayed in the locker) in the Full-Auto Action Replacement description in-game, the guide refers to it as the "88 MOD4".
The 88 Mod 4 pistol is fitted with what appears to be an underbarrel accessory rail, despite the fact it cannot be fitted with any underbarrel attachments in the game.