Brand: Unknown Concept

Model: AR15 Bolt Receiver Saver Set (Upper BK, Lower OG)

Material: High-Impact Reinforced Polymer / Heavy-Duty Plastic Construction

Compatible with: AR-15 / M4 GBBR Series (VFC, GHK, TM MWS, etc.)

Weight: Approx. 40–60g

Dimensions: Custom-engineered for standard AR15/M4 upper and lower receivers

System:The Unknown Concept AR15 Bolt Receiver Saver Set protects your GBBR during transit, storage, and maintenance. The Upper Receiver Saver in Black (BK) plugs into the upper receiver to lock the Bolt Carrier Group (BCG) and charging handle in place, preventing them from sliding out. The Lower Receiver Saver in Olive Green (OG) snaps over the fire-control group to catch the hammer during accidental dry-firing, protecting the fragile aluminum receiver walls and sear assembly from damage. This BK/OG colorway delivers reliable protection with a classic, military-inspired tactical aesthetic