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CMMG MK4T 22LR Complete Upper w/ BCG - 16" Barrel with 1:16 Twist - KeyMod Free Float Handguard

CMMG MK4T 22LR Complete Upper w/ BCG – 16″ Barrel with 1:16 Twist – KeyMod Free Float Handguard

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90 Day No-Hassle Returns We Pay Return Shipping

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at support@at3tactical.com and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at support@at3tactical.com. We may direct you to pursue your warranty claim directly with the manufacturer.

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If you’re dissatisfied with your purchase, in any way, please contact us at support@at3tactical.com – we will do our best to make it right.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

This 22LR Mk4 T Upper Group introduces CMMG’s RKM series of KeyMod free float hand guards. It also features a nitrided 4140 CrMo M4 profile barrel.

  • Caliber: 22 long rifle
  • Barrel: 16”, 1:16 twist, M4 profile, 4140 CM, SBN
  • Muzzle: A2 comp., threaded 1/2-28
  • Hand Guard: CMMG RKM11 KeyMod hand guard
  • Receiver: Forged 7075-T6 AL M4 type upper


Upper Group consists of:

  • Upper Receiver Assembly (Upper Receiver, Ejection Port Cover, Forward Assist, Gas Deflector)
  • Barrel Sub-Assembly
  • Hand Guard and Barrel Nut
  • Charging Handle
  • Bolt Carrier Group

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