The 243 Winchester (6.2x52mm) is a necked-down 308 Winchester introduced in 1955 for small  to medium game hunting. It is the smallest caliber legal for deer hunting in 10 US states. The 243 Winchester, with a muzzle velocity of 3900 fps, is highly accurate at 300 yards. With its low recoil, it can be more accurate for inexperienced shooters. We offer upper receivers that are compatible with both DPMS Gen 1 (LR308) and Aero Precision M5 (AR10) pattern lower receivers. Call us with any compatibility questions, we are here to help.

Any 243 Winchester Upper Receiver we sell can be configured to your specifications before adding it to the cart.  We offer matched muzzle devices, rails, bolt carrier groups, magazines, and charging handles to make your 243 Winchester Upper Assembly turn key and ready to shoot out of the box.

AR15Parts.com components are sourced from top US manufacturers including Aero Precision, Anderson Manufacturing, Ballistic Advantage, Shaw Barrels, Swan Machine, Wilson Arms, Wilson Combat, ZRO Delta, and others. Each upper assembly has options to select Rail, Muzzle Device, Bolt Carrier Group (BCG), Charging Handle, and Magazine. Additional parts are available individually on our website.

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