What are the main differences between the MCK 1.0, 2.0, 3.0, and MCK EVO (4.0) models?

MCK 1.0 (Gen 1): Original, slim/compact product design, non-suppressor and RMR compatible.
MCK 2.0 (Gen 2): Accommodates suppressors up to 1.38″, fires in folded brace position, and adds a push-button integrated spare mag release catch. Not RMR compatible.
MCK 3.0 (Gen 3): Suppressor ready up to 1.5” dia. RMR Compatible. Redesigned charging system that attaches directly to the slide backplate.
MCK EVO (4.0): One Chassis, 120+ Handguns such as Glock, SIG Sauer, Smith & Wesson, Taurus, CZ, HK, and more.
- AR-Style Charging System: perfectly smooth, fully ambidextrous AR-style charging system for unparalleled ergonomics and speed.
- Slimmest Design Yet: By hugging the pistol tightly and removing unnecessary external bulk, it operates as the slimmest and lightest chassis in the CAA lineup.
- Aerospace and Defence Quality: Equipped with metal from front to back, the EVO is solid, holds zero, and trusted by the United States Air Force.

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