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XM307 & XM312
The XM307 & XM312 were two weapons developed as part of the US Military's cancelled Objective Crew Served Weapon (OCSW) project, intended to supplement or replace existing stocks of M2HB heavy machine guns and Mk 19 grenade launchers. The XM307 was also known as the Advanced Crew Served Weapon (ACSW), and fired a 25x59mm computerized HEAB round; a lower-velocity 25x40mm version of this round is used by the Heckler & Koch XM25 and was used by later versions of the equally ill-fated Heckler & Koch XM29 Objective Individual Combat Weapon. The XM307 was able to be converted to the .50 BMG XM312 configuration or vice versa by swapping a small number of parts, in a operation taking a trained crew less than two minutes.
The system's recoil-offsetting system used a moving barrel which was released from the rearward position to travel forward as the weapon fired, forcing recoil to arrest the forward momentum of the barrel before it could have further effect on the weapon. While this resulted in high accuracy and low felt recoil in a system much lighter than the Browning M2, it also resulted in a low rate of fire (260 rpm); this and issues with meeting the system's 40-pound weight goal led to the project's cancellation. A later program for a lightweight M2 supplement, the XM806, used some of the technology seen in the XM312; this project was itself cancelled in 2012 in favour of upgrading existing stocks of M2s. The only surviving part of the XM307 program is the 25x59mm high-velocity round, which is planned for use in the Barrett XM109 Objective Sniper Weapon or "Payload Rifle."
The XM307 & XM312 and variants can be seen in the following films, television series, video games, and anime used by the following actors:
XM307 ACSW
Television
| Show Title | Actor | Character | Note / Episode | Air Date |
|---|---|---|---|---|
| Future Weapons | 2006-2008 |
Video Game
| Game Title | Appears as | Note | Release Date |
|---|---|---|---|
| Battlefield: Bad Company | 2008 | ||
| Battlefield: Bad Company 2 | 2010 |
XM312
Television
| Show Title | Actor | Character | Note / Episode | Air Date |
|---|---|---|---|---|
| Future Weapons | 2006-2008 |
Video Game
| Game Title | Appears as | Note | Release Date |
|---|---|---|---|
| Splinter Cell Chaos Theory | as part of a sentry gun | 2005 | |
| Ghost Recon Advanced Warfighter | 2006 | ||
| Ghost Recon Advanced Warfighter 2 | 2007 | ||
| Battlefield: Bad Company | 2008 | ||
| Army Of Two | used on the hovercraft | 2008 | |
| Battlefield: Bad Company 2 | 2010 | ||
| Blacksite: Area 51 | 2010 | ||
| Army of Two: The 40th Day | 2010 |