CMMG 55CA601 AR-15 Lower Parts Kit

CMMG AR-15 Lower Parts Kit

The CMMG 55CA601 is a purpose-built lower parts kit designed for shooters who want to customize their AR-15 build with premium aftermarket components.

What's Included

This kit provides most of the essential parts needed to assemble your lower receiver, including:

• Hammer and trigger springs
• Selector levers and detents
• Magazine catch and release components
• Takedown pins and springs
• Bolt catch and release parts
• All necessary springs and detents

What You'll Need to Source Separately

The kit intentionally excludes three commonly upgraded components, allowing you to select premium alternatives that match your shooting style and budget:

• Trigger Guard — Choose a match-grade or ambidextrous option
• Fire Control Group — Select a match-grade trigger, single-stage, or two-stage system
• Pistol Grip — Pick ergonomics and controls that suit your hand size and preferences

Quality Standards

All included parts meet or exceed military specification standards, ensuring reliable function and durability. This is a smart approach for serious builders who understand that the trigger group and grip are personal choices that define the rifle's performance and handling characteristics.

Perfect For

Experienced builders and those new to AR platform assembly who want flexibility in selecting their trigger and controls without paying for components they'll replace.