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Critical Handguard Stabilization

The Gun Engineer Quad Rail End Cap delivers essential stability for your AR-15’s free-float system by mechanically locking the handguard against the receiver interface. This precision-engineered component prevents clocking movement during rapid-fire engagements or impact scenarios, maintaining consistent accessory alignment while creating a debris-resistant barrier at the assembly boundary.

Manufactured from aerospace-grade aluminum and protected by MIL-Spec hardcoat anodization, it withstands thermal expansion cycles and friction wear without compromising dimensional integrity.

Securement Features:

  • Rotational Lock Design – Keyed interface prevents torque-induced handguard movement
  • Precision Mating Surfaces – Machined to ±0.002″ tolerance for zero-gap assembly
  • Debris Exclusion Flange – Seals handguard-receiver junction against particulate intrusion
  • 6061-T6 Aluminum Core – Optimal strength-to-weight ratio without barrel harmonics effect
  • Thermal Expansion Compensation – Radial gaps accommodate barrel heat transfer
  • MIL-A-8625F Anodization – Type III Class 1 finish for permanent corrosion resistance

Specifications

Parameter Value
Material 6061-T6 Aluminum
Finish Black Hardcoat Anodized
Fitment Standard Free-Float Quad Rail Handguards
Mounting Method Slip-Fit Compression Ring
Weight 0.6 oz (17 g)
Dimensions 1.35″ OD × 0.32″ H
Compatibility AR-15 Free-Float Systems
Country of Origin Malaysia

Manufactured in Malaysia by Gun Engineer, ensuring precision and reliability.

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