Vault-Lock Rear Cover w/ Bearings

The Vault-Lock Rear Cover with Bearings from Diversified Machine is a precision aluminum gear cover engineered for quick-change rifle systems. Manufactured in black anodized aluminum, this rear cover integrates bearing assemblies to enable smooth, repeatable indexing and secure locking of modular barrel and bolt carrier configurations. The RRC-1373 is designed for shooters who demand rapid barrel interchange without sacrificing zero retention or mechanical stability.

The integrated bearing system reduces friction during quick-change transitions and provides precise seating, critical for maintaining point-of-aim when swapping between different barrel profiles or calibers. At 6.8 lbs, the rear cover carries modest weight while the reinforced aluminum construction and black anodized finish resist corrosion in variable environments. Dimensionally compact at 12.3 x 2.7 x 12.3 inches, it interfaces directly with Diversified Machine's DMI quick-change platform, a system widely adopted in modular rifle builds where configuration flexibility is essential.

This component serves precision rifle builders, competitive shooters, and firearms professionals who rely on modular systems for training, testing, or operational deployment. The bearing-equipped design is particularly valuable in high-round-count training where repeated barrel changes occur without removing the upper receiver, and in multi-caliber platforms where caliber flexibility drives barrel inventory. Users operating in corrosive environments or wet climates benefit from the anodized finish's enhanced durability compared to raw aluminum.

Diversified Machine gear covers are part of an ecosystem of modular components that prioritize precision engineering and repeatability. The Vault-Lock system represents an evolution in quick-change design where mechanical lock security and smooth bearing operation are optimized together, distinguishing this approach from friction-only retention methods used in less sophisticated quick-change platforms.