5.7x28mm Complete Upper 16″ – AR57

This complete upper receiver is ready to drop onto your AR-15 lower receiver and convert it into a 5.7x28mm firearm, making it an AR-57! This 5.7 upper ships with a 50-round P90 style magazine included that attaches above the barrel, allowing the original lower receiver’s magazine well to be used as an ejection port. Also included is a 5.7x28mm optimized buffer that suits the lighter recoiling round. The upper’s handguard uses MLOK slots along with small 1913 Picatinny rail sections to allow for a variety of customizations and configurations by the end user. Milled from a block of aluminum alloy, this upper is a lightweight and rugged receiver. 

• 5.7x28mm Complete Upper 16″ – AR57
• Includes one 50-round magazine
• Includes 5.7 Optimized Buffer
• Drop-in ready, Complete Upper

Simply add your favorite aiming solution to this upper receiver, drop it onto your lower, fill the included magazine up and slip the included buffer into place, and you’re ready for range time! The 5.7×28 cartridge is a light-recoiling and capable round that is perfect for your AR. With many manufacturers getting into making 5.7 products, now is the time to pick up an upper receiver chambered in this advanced NATO cartridge! Order your 5.7x28mm complete upper receiver online here!

Need any 5.7 ammo? Click here!

Looking for extra magazines? Check if we have them in stock here!

Caution : Must install buffer before use