The Aero Precision M5/AR308 M5E1/BAR Barrel Nut Assembly (APRH308910) connects M5 Enhanced Handgaurds to DMPS pattern threaded upper receivers. Machined from 1144 Stressproof® Steel and QPQ/Melonite coated to prevent corrosion against the elements. A Shim pack (5 shims) is included to properly time the gas tube with the upper receiver.

Features:

• Material: Machined from 1144 Stressproof® Steel
• Coating: QPQ/Melonite
• Torque to 65 ft lbs with a standard AR15 armorer's wrench

Includes:

• M5E1 Handguard Barrel Nut
• Shim Pack (5 shims)

Note: If you intend to connect an Aero Precision Handguard to a standard threaded upper receiver, you will need a M5E1 Handguard Barrel Nut.