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Questions & Answers
Is this the 6mm arc cartrige?

Yes, but always check your order to make sure you have the caliber, color, barrel length and twist rate correct. I’m very happy with the one I ordered from here, this exact one, sub moa and minimal poi change as it heats up with high volume long range shooting.

by Shooter208, Verified Owner, November 20, 2025
Customer Reviews
Helpful Positive Review
still in the box by Flash, Verified Owner, August 28, 2024
I’m just reviewing it from calls and research. I was going to order a barrel and bolt plus everything to build a complete upper but instead went with this Rise. I would have liked it to come with an adjustable gas block since I’m going to run a suppr...
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Product Info for RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver

Chambered in 6 ARC, this AR-15 complete upper receiver features an exceptionally accurate 18-inch 416R stainless steel threaded barrel.image

WARNING: California`s Proposition 65

Specifications for RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver:

Manufacturer: RISE Armament
Caliber: 6mm ARC
Overall Length: 26 in
Barrel Length: 18 in
Gas System Length: Rifle Length
Barrel Twist Rate: 1-7
Firearms Threads Per Inch: 1/2x28
Handguard Type: Free-Float
Muzzle Device: Thread Protector
Fabric/Material: 416R Stainless Steel
Handguard Length: 15.25 in
Gun Rail: Picatinny
Gun Make: AR Platform
Gun Model: AR-15
Mount Type: Picatinny

Features of RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver

  • Barrel: 18-inch 416R stainless steel, button-rifled, air-gauged and tested; threaded
  • Handguard: Free-floating skeletonized aluminum with continuous 12 o’clock Picatinny rail, MLOK slots, four threaded steel sling swivel QD inserts, a snag-free front, and patent-pending attachment lock to maintain your zero
  • Charging Handle: RISE ambidextrous charging handle for right- or left-handed operation and improved ease of use with optics and gloves
  • Bolt Carrier Group: Premium BCG with 9310 bolt, individually MPI tested, staked gas key, durable black nitride finish
  • Receiver: Forged billet aluminum
  • Warranty: Backed by RISE’s Lifetime Warranty and More-Bang-for-Your-Buck Guarantee 
  • Other Caliber Available: Available in 22 ARC Uppers

Package Contents:

  • RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver

RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver Orderable Models

List of Orderable Models

  • RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver, Rifle Length, 1-7 Twist, 1/2x28, Dark Gray, RA-6ARC-CU-GRY-18 , MPN: RA-6ARC-CU-GRY-18 , UPC: 850043415961 , Code: 2AL-URC-AR1DS-RA-6ARC-CU-GRY-18
  • RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver, Rifle Length, 1-7 Twist, 1/2x28, Black, RA-6ARC-CU-BLK-18 , MPN: RA-6ARC-CU-BLK-18 , UPC: 850043415947 , Code: 2AL-URC-AR1DS-RA-6ARC-CU-BLK-18
  • RISE Armament AR-15, 6mm ARC, 18in Complete Upper Receiver, Rifle Length, 1-7 Twist, 1/2x28, Patriot Brown, RA-6ARC-CU-BRN-18 , MPN: RA-6ARC-CU-BRN-18 , UPC: 850043415954 , Code: 2AL-URC-AR1DS-RA-6ARC-CU-BRN-18
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