Installation Instructions

7
• The barrel nut must be perfectly aligned to ensure proper function of the
upper. If the barrel nut is not centered it will put pressure on the drive rod
and cause it to bind during operation
Drive Rod Gapping
Tools/equipment required
1. Nylon/plastic hammer
2. Feeler gauge/business cards
3. BCG
4. 1/8
th
allen key / Inch – Lbs Torque Wrench