Bushmaster offers a range of high-quality lower receivers designed to meet various build preferences and performance needs. These receivers are crafted from forged 7075-T6 aluminum, ensuring durability and longevity. They are finished with a Type III hard coat anodizing to resist wear and corrosion. The receivers are compatible with standard AR-15 components and are marked 'Multi,' providing flexibility for various caliber builds. Safety selector markings include 'Safe,' 'Semi,' and 'Burst' positions for clear operation. Additionally, the XM15-E2S stripped lower receiver comes equipped with a 1/4 x 28 tension screw to ensure a tight fit between the lower and any upper assembly. Bushmaster's lower receiver lineup includes both stripped and complete configurations. The stripped lower receivers serve as a blank canvas for custom builds, allowing enthusiasts to select and install their preferred components. For those seeking a ready-to-use option, Bushmaster provides complete lower receivers equipped with features such as a 6-position buffer tube, M4 carbine stock, A2 pistol grip, and mil-spec trigger. Some models, like the BFSIII M4 built lower receiver, come with an upgraded BFSIII AR-C1 trigger and ambidextrous safety selector, offering safe, semi, and binary firing modes for enhanced control and versatility. These lower receivers are suitable for various applications, including custom builds, upgrades, and replacements, catering to both enthusiasts and professionals. Bushmaster's commitment to quality ensures that each lower receiver meets rigorous standards for performance and reliability.