CMMG

Upper Receiver Assembly

Whether its the classic style or forward assist functionality that piques your interest the Mk4 AR15 upper receiver assembly has been a staple in the CMMG lineup. Available in seven different Cerakote finishes this mil-spec workhorse has been proven over the years and makes a great base to build your next AR15 upper group.

This forged mil-spec upper receiver no longer features an enlarged ejection port. For pistol-caliber builds this may or may not result in occasional ejection issues. Please see product 55BA290 for use on pistol-caliber firearms as it does feature an enlarged ejection port specifically for that reason.

Lifetime Quality Guarantee

Every CMMG product is backed by a Lifetime Quality Guarantee against material and workmanship defects.

Description:

• Midnight Bronze
• Platform: Mk4
• Upper Receiver: Forged 7075-T6 Aluminum M4 Type
• Finish: Cerakote Standard