Whether it’s 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 six 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.
Specifications:
- Platform: MK4/AR-15
- Upper receiver: forged 7075-t6 Aluminum M4 type
- Finish: Armors Black cerakote standard
SKU: APRH100107C
SKU: APAR308503C
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