The Aero Precision A15-most commonly encountered in the firearms market stamped as the "X15" or "AR15 Gen 2"-is the foundational lower receiver that catapulted Aero Precision out of behind-the-scenes aerospace machining and into the spotlight as one of the premier component manufacturers for home gunsmiths and AR-15 builders. The naming convention was a direct nod to the historic, hypersonic North American X-15 rocket plane, tying the platform back to their aerospace roots. Machined from high-grade 7075-T6 aluminum forgings, the A15/X15 provided an affordable alternative to low-tier, out-of-spec cast receivers while delivering tighter machining tolerances than typical military-contract parts. This firearm comes with a Vortex magnifyer and red dot as seen in photos.