The Sharps Bros The Jack AR-15 Multi-Caliber Stripped Lower Receiver Gen2 is an exceptional choice for firearm enthusiasts seeking precision and versatility. Meticulously crafted from 7075-T6 aluminum this lower receiver boasts a robust black hardcoat anodized finish ensuring durability and sleek aesthetics. Its design features a threaded bolt catch pin reduced weight and improved styling setting it apart from other options. The integral trigger guard and beveled magazine flare enhance functionality making it compatible with all mil-spec internal parts aftermarket mil-spec upper receivers GI standard issue magazines and PMags. Ideal for those looking to build a custom AR platform The Jack offers unparalleled adaptability with its multi-caliber mark ready to be completed with your choice of lower parts kit buffer and stock.