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 robust assembly designed for the AR-15 platform, crafted from durable 7075-T6 aluminum. This set includes both the lower and upper receivers, making it ideal for builders looking to create a reliable and precise firearm chambered in 5.56 NATO. Commonly found in mid-range to high-performance builds, this receiver set offers a solid foundation for various configurations.
Specifications
October 2026 on GunPartPicker
Centurion Arms CM4 5.56 Forged AR-15 Receiver Set ranked #39 of the 588 lower receivers builders added on GunPartPicker in October 2026, behind the Aero Precision AR-10 Stripped Lower Receiver Anodized Black, with about 1 in every 250 lower receivers added to builds. Down from #16 in September. Builds with this lower receiver are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today both retailers we track have it in stock. Prices barely moved in October 2026, holding around $225.63, with no real sale all month. Buying today, the lowest price is $225.63 at AR15 Discounts, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
Geissele Automatics G2S Two Stage AR-15 Trigger .154"
Sons of Liberty Gun Works AR-15 Gas Tube Stainless Steel Mid-Length
Sons of Liberty Gun Works Gas Block V2 - .750"
Bravo Company M16 Bolt Carrier Group Black
FN AR-15 M16 Barrel 16 Mid-Length 5.56mm
Magpul MOE Grip Polymer Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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