Centurion Arms CM4 5.56 Forged AR-15 Receiver Set
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Centurion Arms
Overview
The Centurion Arms CM4 5.56 Forged AR-15 Receiver Set is a complete assembly designed for the AR-15 platform, crafted to accommodate the 5.56 NATO caliber. Being a forged receiver set, it provides enhanced strength and durability, making it a reliable foundation for your build. This receiver set is commonly used in a variety of tactical and sport shooting configurations, ensuring versatility for different applications.
Specifications
August 2026 on GunPartPicker
Centurion Arms CM4 5.56 Forged AR-15 Receiver Set ranked #26 of the 507 lower receivers builders added on GunPartPicker in August 2026, behind the PSA PA15 Complete Classic EPT A2 Lower Receiver - 7781023, with about 1 in every 143 lower receivers added to builds. Up from #29 in July. Builds with this lower receiver are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and nearly all AR-15.
It was hard to find in August 2026, in stock on only 5 of the 11 days we checked, and today the one retailer we track is out of stock. Prices barely moved in August 2026, holding around $225.63, so there haven't been real sales lately. Listed prices start at $225.63 at Primary Arms for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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Frequently Built With
The part most often added in each category by the 41 builds that include this one
Geissele Automatics G2S Two Stage AR-15 Trigger .154"
Bravo Company M16 Bolt Carrier Group Black
BCM GFHMK2MED Ambidextrous MK2 Charging Handle Compatible w/ Mil-Spec AR-15 Black 7075 T-6 Aluminum
FN AR-15 M16 Barrel 16 Mid-Length 5.56mm
Bravo Company AR-15/M16 .750 Low-Profile Gas Block
Magpul MOE Grip Polymer Black
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