File:M249 components.jpg
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Summary
| Major component groups of the M249 SAW: | ||
|---|---|---|
| No. | Components | Purpose |
| 1 | Barrel assembly | Houses cartridges for firing, directs projectile, and supports the gas regulator. |
| 2 | Heat shield assembly | Provides protection for the gunner’s hand from a hot barrel. |
| 3 | Rear sight assembly | Adjusts for both windage and elevation. |
| 4 | Cover and feed mechanism assembly | Feeds linked belt ammunition, and positions and holds cartridges in position for stripping, feeding, and chambering. |
| 5 | Feed tray assembly | Positions belted ammunition for firing. |
| 6 | Cocking handle assembly | Pulls the moving parts rearward. Moves in a guide rail fixed to the right side of the receiver. |
| 7 | Buttstock and buffer assembly | Contains a folding buttplate. Serves as a shoulder support for aiming and firing M249. Contains a folding shoulder rest and a hydraulic buffer to absorb the recoil. |
| 8 | Bolt assembly | Provides feeding, stripping, chambering, firing, and extraction, using the projectile gases for power. |
| 9 | Slide assembly | Houses firing pin and roller assembly. |
| 10 | Return rod and transfer mechanism assembly | Absorbs recoil for bolt and operating rod assembly at the end of recoil movement. |
| 11 | Receiver assembly | Serves as a support for all major components and houses action of weapon. Through a series of cam ways, controls functioning of weapon. |
| 12 | Trigger mechanism | Controls the firing of the weapon. Provides storage area for lubricant in grip portion. |
| 13 | Handguard assembly | Provides thermal insulation to protect the gunner’s hand from heat or extreme cold and houses the cleaning equipment. |
| 14 | Sling and snap hook assembly | Provides a means of carrying the weapon. |
| 15 | Bipod | Supports the M249 machine gun in the prone position. The telescopic legs can be individually adjusted to three different lengths. |
| 16 | Gas cylinder assembly | Locks bipod in place and provides passageway for gases. |
| 17 | Piston assembly | Holds the bolt and slide assemblies and houses the return spring. |
| 18 | Return spring | Returns bolt, slide, and piston assemblies to locked position during counterrecoil cycle. |
|
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| Date/Time | Thumbnail | Dimensions | User | Comment | ||
|---|---|---|---|---|---|---|
| current | 09:36, 19 April 2013 | | 493 × 523 (55 KB) | Maintenance script (Talk) | Automated mass import from old server |
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