These Ballistic Advantage enhanced lowers are the same as the Aero Precision M4E1 lowers. They are currently 20% off and I was able to use code “Save10now” for an extra 10% off. Total was $73. They also have free shipping.
BA AR-15 Enhanced Lower Receiver
Ballistic Advantage AR 15 lower receiver in black finish. Ballistic Advantage has all of your AR 15 replacement parts in stock.
www.ballisticadvantage.com