Grid Defense - .300 Blackout, 5.56, 7.62x39 & Other Upper Receivers — 4 products / 52 models — Page 1

Complete your dream AR-15 build with Grid Defense gun parts. We carry a variety of their AR upper receivers in popular calibers like .300 Blackout, 5.56 NATO, and 7.62x39mm available with different gas system and barrel lengths to suit your exact needs. Some of these AR-15 uppers also include different types of muzzle devices like A2 flash hiders or flash suppressors to compliment your shooting style and improve your vision and control in the field. Find the perfect AR upper with your required specifications and choose from premium finishes and colors to customize your build exactly how you want it.

Make sure to check out our current deals for more ways to save on essential gun accessories like rifle scopes, vertical grips, and buttstocks. Need help selecting the right option for your firearm? Then read our Upper Receiver Guides for tips on choosing the best AR-15 upper receiver for your need. Shop online at OpticsPlanet today to get Free Shipping on most orders over $49.