Aero Precision M5 Threaded Assembled Upper Receiver AR Platform 22in Low Profile 1-8 Twist 5/8x24 Thread OD Green. 308 Upper Receiver is an excellent addition for your rifle that will create a smoother shooting experience while adding some sleek style to your weapon. Also this upper comes with the port door and forward assist hardware pre-installed for the simplest installation possible. Aero Precision forged these AR15 Upper Receivers from 7075-T6 aluminum for a lightweight build that is remarkably durable and each handguard is anodized to increase its resistance against both corrosion and abrasion. Attach scopes lasers and other accessories with ease onto this Aero Precision M5 .308 Upper Receiver and the laser engraved T-marks help you remember where you placed your attachments when you need to remove them. Equip the Aero Precision M5 .308 Assembled Upper Receiver to create a more reliable and sturdy weapon. Specifications for Aero Precision M5 .308 Assembled Upper Receiver: Manufacturer: Aero Precision Fabric/Material: 7075-T6 forged aluminum Caliber: .308 Winchester Gun Make: Aero Precision Gun Model: M5 Additional Features: Works with standard AR15/M16 components Condition: New Country of Origin: USA Weight: 14 oz Features of Aero Precision M5 .308 Assembled Upper Receiver: M4 Feedramps .2795in takedown pin holes (DPMS size) Lazer engraved T-marks DPMS High Profile (.210) Tang) Package Contents: Aero Precision M5 Threaded Assembled Upper Receiver Port Door Forward Assis What firearm models does the manufacturer say Aero Precision M5 .308 Assembled Upper Receiver is compatible with? The manufacturer suggests that Aero Precision M5 .308 Assembled Upper Receiver is compatible with M5Aero Precision APAR308631AC: M5 Threaded Assembled Upper Receiver AR Platform 22in Low Profile 1-8 Twist 5/8x24 Thread OD Green