LA-N15(TM) Raven(TM) Side Charging Billet Receiver SetUtilizing our USC(TM) Upper Side Charging Receiver in combination with our LA-N15 Raven(TM) lower this perfectly matched billet receiver set is ideal for new rifle builds in multi calibers.Packed full of features including a broached internally flared magwell, spotface takedown area, ultra smooth proprietary bore, radiused Cam Pin slot, reduced diameter barrel extension area for precise barrel fit, rear set screw lug tensioning & precision machining including reamed holes and single point milled, single operation extension threads.The USC(TM) features strengthened side walls to reduce flex and enhance accuracy while limiting weight.Also features a shrouded Bolt Catch area to reduce snagging and damage to controls.This is the perfect combination of upper and lower recievers with advanced features and the highest quality in materials and manufacturing process.