Radical Firearms Complete AR-15 Lower Receiver With B5 Systems Stock & Grip
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Radical Firearms
Overview
The Radical Firearms Complete AR-15 Lower Receiver comes fully assembled, ready to integrate with your upper for immediate use. It features a hardcoat anodized finish that enhances durability and resistance to wear, while the .154 trigger pin size ensures compatibility with a wide range of aftermarket triggers. This lower receiver is particularly suited for builds utilizing a mid-length gas system and chambered in 5.56 NATO, making it a solid choice for those looking to balance performance and reliability in their AR-15 setups.
Specifications
Radical Firearms Complete AR-15 Lower Receiver With B5 Systems Stock & Grip
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August 2026 on GunPartPicker
Radical Firearms Complete AR-15 Lower Receiver With B5 Systems Stock & Grip ranked #137 of the 507 lower receivers builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #313 of the 997 lower receivers builders have added. Builds with this lower receiver are nearly all chambered in 5.56 NATO, mostly on mid-length gas (67%, then carbine-length 33%), and nearly all AR-15.
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Frequently Built With
The part most often added in each category by the 19 builds that include this one
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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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