Every 243 WINCHESTER Upper we sell can be configured to your specifications. Customize your 243 WINCHESTER Complete Upper with an optic, muzzle device, rail, bolt carrier group, magazine, or charging handle from our matched selection. Your 243 WINCHESTER AR 10 Upper Receiver will arrive turn-key and ready to shoot out of the box.

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243 WINCHESTER (6.2x52mm) is a necked-down 308 that is ideal for small- to medium-game hunting. It is the smallest caliber legal for deer hunting in 10 US states. With a muzzle velocity of 3900 fps and low recoil, it is highly accurate at 300 yards.

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.243 WINCHESTER Uppers For Sale

What is a 243 Winchester Upper?

The 243 Winchester upper receiver brings the advantages of the .243 Winchester ammunition to the AR-10 / LR308 platform. Compared to the 308 WIN, 243 Winchester is smaller diameter, making it better for varmints; lower recoil and flatter trajectory, making it more accurate; and high energy, making it effective for medium game like pronghorn and white-tail deer.

What is the Effective Range of a 243 Winchester Upper?

The effective range of a .243 Winchester Upper receiver is at least 500 yards. 243 Winchester is an overall more accurate round than 308 WIN.

What is the average recoil of an AR-10 with a 243 Winchester Upper?

The average recoil of a 243 Winchester upper receiver, loaded with 100gr ammunition, on a typical AR-10 platform, is roughly 9 foot-pounds. This is about 60% of the 15-16 foot-pound recoil of a typical 308 WIN AR10.

Will the 243 Winchester Upper fit my Lower?

Unlike AR15, the AR10/LR308 platform is not standardized, so not every upper will fit every lower. We offer 243 Winchester uppers with either DPMS Gen 1 or Aero Precision M5 Upper Receivers. This covers the vast majority of lowers, but there are some exceptions so if you have any questions, contact our support team at 866.706.0633 or [email protected].

What BCG and Magazine do I Need for a 243 Winchester Upper?

The 243 Winchester Upper Receiver uses the standard 308 WIN Bolt Carrier Group (BCG) and the standard 308 WIN / 7.62x51 NATO Magazine. So, swap out the Upper and load 243 Winchester ammo and you are ready to go.

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