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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October 2026 on GunPartPicker
Radical Firearms Complete AR-15 Lower Receiver With B5 Systems Stock & Grip ranked #335 of the 588 lower receivers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #265 of the 1,217 lower receivers builders have added. Builds with this lower receiver are mostly chambered in 5.56 NATO (73%, then 300 Blackout 20%), mostly on mid-length gas (70%, then carbine-length 10%), and nearly all AR-15.
Updated · from real builds on GunPartPicker
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Frequently Built With
The part most often added in each category by the builds that include this one
Radical Firearms 5.56 Socom AR-15 Barreled Upper - Mhr Handguard - 16"
Magpul RVG Rail Vertical Grip - Black
Radian Raptor Slim Line Ambidextrous AR-15 Charging Handle - Black
Radical Firearms 5.56/300 Black Melonite AR-15 Bolt Carrier Group - Gen 2
Otter Creek Polonium K 556 Rifle Suppressor - Black
SIG Sauer Romeo 5XDR Gen II Red Dot Dot w/ Juliet 5 Micro Magnifier - SORJ5X201
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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