Aero Precision M4E1 Threaded Assembled Receiver Set, Black

The M4E1 receiver set is a precision crafted combination designed for those seeking top-tier performance and reliability in their firearm build. This set includes a stripped lower receiver featuring an integrated trigger guard for added durability and ease of use. Paired with the assembled upper receiver, which undergoes an advanced forging process to ensure superior strength and a smooth, refined finish, this set provides an exceptional foundation for your custom build. Combining functionality with sleek aesthetics, the M4E1 receiver set is ideal for both experienced builders and first time assemblers, delivering a perfect blend of innovation and craftsmanship.Threaded takedown pin detent recess - this feature enables users to effortlessly install the takedown pin detent and spring using a 4-40 set screw, effectively preventing the detents from being inadvertently launched across the roomEnhanced magwell flare - the magwell flare has been augmented to facilitate rapid and efficient magazine changesThe newly improved forging process imparts a "billet look" to the upper receiverThe new picatinny profile integrates seamlessly with our enhanced and Atlas series handguardsM4 feed ramps0.250 inches takedown pin holesLaser-engraved T-marksThe threaded bolt catch roll pin facilitates straightforward installation of the bolt catch and significantly reduces the risk of damaging the finish during the installation processThe pin is includedThe integrated trigger guard design eliminates the risk of breaking the trigger guard tabs by incorporating the trigger guard into the lower receiverThis integration results in a stronger and more rigid platform for further developmentThe upper tension screw enables precise adjustment of the fit between the upper and lower receiversThis is achieved through a nylon-tipped tensioning set screw inserted into the grip tang of the lower receiver, ensuring a secure fit with any standard AR-15 upper receiver