V Seven M4 Upper Assembly w/Diamond Forward Assist. These AR15 Upper Receivers from Vaquero Arms are machined from 7075 T6 aluminum forging to create a durable platform that's lightweight. For the best firing experience possible the Vaquero Arms M4 Upper Assembly includes an Ultra-Light Forward Assist Ultra-Light Port Door and a Rod Support Base offering incredible light transmittance and a strong barrier against intrusive outside elements. This Vaquero Arms M4 Upper Assembly w/V Seven Ultra Light Forward Assist also includes an M4 extended feed ramp so you can take full advantage of the capabilities of your firearm. When you need a reliable and feature rich upgrade for your M4 upper look no further than Vaquero Arms M4 Upper Assembly. Specifications for V Seven M4 Upper Assembly: Manufacturer: V Seven Color: Black Finish: Anodized Fabric/Material: 7075 T6 FORGING Gun Make: AR Platform Gun Model: AR-15 Condition: New Features: For Ar-15 Machined From 7075 T6 Forging Mil-Std 1913 Rail For Mounting Optics/Accessories M4 Extended Feed Ramps Typeiii Hardcoat Anodized Assembly Includes Installed V Seven Ultra-Light Forward Assist Ultra-Light Port Door & Port Door Rod Included Accessories: Spring & Pin Package Contents: V Seven M4 Upper Assembly What firearm models does the manufacturer say V Seven M4 Upper Assembly is compatible with? The manufacturer says that V Seven M4 Upper Assembly is compatible with AR-15V Seven M4-UPA-DIAM: M4 Upper Assembly w/Diamond Forward Assist