Manual

Iron Brigade Armory, Ltd. considers all procedures included in the USMC M40A3

Technical Manual (TM05539D-10/1) to be acceptable for use on the XM-3 SWS.

All M40A3 gauges used by USMC 2111/2112 armorers are acceptable for use on

the XM-3 SWS. The procedures and/or specifications preferred by Iron Brigade

Armory are listed below for reference purposes.

Headspace: 1.630 Minimum “Go”

1.636 Maximum “No Go”

Bore Erosion: “0” Minimum

(Reference purposes only) “4” Maximum

Trigger Pull: 3.25 lbs Minimum

4.00 lbs Maximum

Firing Pin Protrusion .045 Minimum

(Remington Factory Spec) .075 Maximum

Scope Ring Torque 68 inch lbs +/- 3% consistent

Trigger Guard Bolt Torque 68 inch lbs +/-3% consistent

Trigger Guard Bolt Size T-30 Torx

Scope Ring Screw Size T-15 Torx

Scope Mount Base Screw Size T-15 Torx

UNS Mount Screw Size T-15 Torx

LTI/PFI Procedures:

1. Ensure the weapon is unloaded (Visually and physically inspect the

chamber).

2. Inspect overall weapon system for cracks, dents, excessive wear or any

obvious defects.

3. Before disassembling check torque setting on scope ring cross bolt and

trigger guard bolts with the provided torque wrench (The bolts/nuts should

not accept torque assuming they were installed correctly from previous

inspections).

4. Check/Confirm Headspace and notate results in provided data/gun book.

5. Check/Confirm Bore Erosion if applicable gauge is available (Not required

for safety purposes, reference purposes only).

6. Check/Confirm Trigger Pull (The Trigger Pull should consistently break

within .25 lbs of set weight for a period of 5 consecutive pulls/breaks).