Specifications

TM 05539-IN

MUZZLE BREAK MAINTENANCE - CONTINUED 0017 00

0017 00-3

INSTALLATION

1. With the barrel (3) pointing up (vertical), install the shims (4) on the barrel. Ensure the shims are centered on the barrel.

2. Install the muzzle break (1) over the shims and onto the barrel (3) and slowly tighten by hand.

3. Secure the barrel (3) in a vise or fixture.

4. Using the combination wrench and a torque wrench, tighten the muzzle break (1) to 20-23 lb-ft.

5. Check alignment of the index notch (5); it should be positioned at bottom dead center (BDC) after torque. If the index

notch is not at BDC, add shims between the barrel (3) and muzzle break (1) as described until alignment is achieved.

Consult the shim chart below and the timing wheel on the following page as aids in determining the correct amount of

shims needed for proper alignment of the index notch.

Table 1. Shim Chart.

Thickness Amount

Note: Approximate amount shim will rotate adapter.

.005 = 1/8 of a turn

.008 = 1/5 of a turn

.010 = 1/4 of a turn

.012 = 1/3 of a turn

.020 = 1/2 of a turn

M40-093