Operator's Manual

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CONTENTS
1. General Parts Nomenclature ......................... 4
1.1 Left Side View
1.2 Right Side View
2. Forward .......................................................... 6
3. Contents of Storage Box ............................... 6
4. Firearm Safety and Warnings ...................... 7
5. General Firearms Safety Information ....... 14
6. Description and Operation.......................... 14
6.1 Description
6.2 Operation
7. Nomenclature .............................................. 15
8. Serial Number .............................................. 15
9. Initial Cleaning............................................. 15
10. Operation of the Safety Selector ............. 16
11. Cocking the Slide Hammer
and Charging Handle Operation ............... 16
12. Manual Bolt Lock Device .......................... 17
13. Ammunition ................................................ 19
14. Feeding Methods and Capacities............. 20
14.1 Disintegrating Linked Belt
and Ammunition Pack
14.2 30 Round Magazine
15. Loading ....................................................... 20
15.1 Linking Ammunition
and Filling the Ammunition Pack
15.2 Filling the Magazine
15.3 Loading the M249S
™
from the Ammo Pack/Belt
15.4 Loading the M249S
™
from the Magazine
16. Firing .......................................................... 26
16.1 Firing Procedures
16.2 Malfunctions
17. Unloading/Clearing .................................... 28
17.1 Unloading/Clearing from Belted Ammo
17.2 Unloading/Clearing from a Magazine
18. Sights and Zeroing .................................... 30
18.1 Rear Sight Assembly
18.2 Front Sight Assembly
18.3 Zeroing Procedures
18.3.1. Rear Sight
18.3.2 Front Sight
19. Barrel Change Procedures ...................... 34
20. Dust Cover Operation ................................ 35
21. Bipod Operation ......................................... 36
22. Buttstock / Shoulder Rest Operation ....... 37
23. Optional Sling Operation ........................... 38
24. Disassembly / Field
Stripping Procedures ................................ 39
24.1 Subassembly Identification
24.2 Raise Feed Tray Cover
24.3 Rotate Buttstock Open
24.4 Remove Drive Spring, Hammer Spring
and Guide Rod
24.5 Remove the Moving Parts Assemblies
24.5.1 Slide Hammer
24.5.2 Bolt and Bolt Carrier Assemblies
2.1 Bolt Carrier Assembly
2.2 Bolt Assembly
24.6 Remove the Buttstock
24.7 Remove the Trigger Assembly
24.8 Remove Barrel Assembly
24.8.1 Remove Heat Shield
24.9 Remove Gas Cylinder
24.10 Remove Bipod Assembly
24.11 Remove Handguard Assembly
25. Cleaning and Lubrication.......................... 45
25.1 Receiver and Feed Tray Cover Assembly
25.2 Drive Springs and Guide Rod
25.3 Moving Parts Assembly
25.4 Barrel
25.5 Gas Cylinder
25.6 Trigger Assembly
25.7 Bipod Assembly
25.8 Rear Sight Assembly
25.9 Lubrication in Normal Conditions
25.10 Lubrication in Adverse Conditions
25.10.1 Dry and Dusty Conditions
25.10.2 Extreme Cold Conditions
25.10.3 Hot and Humid Conditions
26. Assembly .................................................... 51
26.1 Install Handguard
26.2 Install Bipod
26.3 Install Gas Cylinder
26.4 Install Barrel Assembly
26.4.1 Install Heat Shield
26.5 Install Moving Parts Assembly
26.5.1 Reassemble Bolt
26.5.2 Reassemble Moving Parts Assembly
26.5.3 Install Moving Parts Assembly
26.6 Install Slide Hammer
26.7 Assemble Drive Springs and
Guide Rod Assembly
26.7.1 Install Drive Springs and Guide Rod
26.8 Install Trigger Assembly
26.9 Install Buttstock Assembly
26.10 Close Top Cover Assembly
27. Function Check ......................................... 56
28. Optional Tools and Gauges ....................... 57
28.1 Headspace Gauge Use
28.2 Breech Bore Gauge Use
28.3 Tubular Socket Wrench Use
29. Service Policy and
Technical Questions .................................. 61
30. Contact Us.................................................. 62
31. Technical Specifications ........................... 63
32. ATF Approval Letter ................................... 64