M40

The M40 is a bolt-action sniper rifle designed in the mid-1960s by U.S. Marines who were modifying Remington 700s during the Vietnam War. It fires the 7.62x51mm NATO rounds from a 5-round box magazine at an effective range of up to a maximum of 1000 yards.

Battlefield Vietnam
The M40 is issued to USMC and MACVScout kits on certain maps. It has very high multipliers, a low rate of fire, high recoil, good accuracy and a 6X scope meant for long range engagements. Its high damage can kill an enemy in 2 body shots or a single head shot and its accuracy will make it so it can easily hit a target from 200–250 meters away. Although being difficult to use in close-quarters due to its low rate of fire, the small cross hairs and high damage can prove to be effective when no-scoping and engaging enemies in such situations. The M40 A5 Variant known today is the standard anti-personnel rifle employed by USMC Scout/Snipers. The A5 variant is configured as such: Remington 700 Action, Mcmillian Group International stock, Badger optic mounts, Schmidt & Bender Optic, and The barrel is manufactured at Quantico by the USMC. It's lack of effectiveness on this Game is not a accurate representation of its true combat effectiveness.

Battlefield: Bad Company 2: Vietnam
In Battlefield: Bad Company 2: Vietnam, the M40 is a weapon issued to the Recon kit. It is the only bolt-action sniper rifle featured in the expansion pack. It is capable of one-hit kills at all ranges in Hardcore mode, even without Magnum Ammunition, due to its minimum damage being 70. It is equipped with a 6x scope by default, but it can equip a 12X High Power Scope instead if the player chooses said specialization.

On the left side of the rifle, one can see that it says "Hell Sucks!" scratched in. One can also see a very blurry text reading, "Born to kill" on the left side of the magazine possibly reffering to the 1987 Vietnam War movie "Full Metal Jacket" where the main character Joker had "Born to kill" written on the front of his helmet.

Battlefield 3
"Developed around the Bolt-Action of a proven American hunting rifle, the M40A5 has been upgraded with a lightened fiberglass stock, a detachable magazine, and the provisions for mounting suppressors. An incredibly accurate rifle, the M40A5 currently serves as the primary Sniper Rifle for the USMC. The M40A5 is by default equipped with a Rifle Scope (8x)."

- Battlelog description

The M40 returns to Battlefield in a more modernized version rather then being the first variant.

Singleplayer
During the campaign it is the starting weapon in Night Shift, it is equipped with a IRNV scope, Straight Pull Bolt and a suppressor. It can kill any enemy in one shot no matter what body part the bullet hits. It also has more reserve ammunition than its Multiplayer counterpart.

Multiplayer
In Multiplayer the M40A5 is the third sniper rifle unlocked for the Recon Kit. It has a higher rate of fire than any other Bolt-action in-game, but suffers the slowest bullet speed compared to any other bolt-action. This can make it an optional choice for a close range sniper due to its rate of fire (which increases when Straight Pull Bolt is attached).

When compared to the SV-98, while the SV-98 bullet travels faster, and the place of impact is predictable, it also has less damage after twenty meters, and will drop to 50 damage after eighty meters (still allowing a one-shot kill in the chest in Hardcore mode, but not in the legs), while the M40A5 gives 59 damage after one-hundred meters, allowing a one-shot kill anywhere in Hardcore.

Battlefield 3: Aftershock
The M40A5 appears as one of the four selectable primary weapons in Battlefield 3: Aftershock. The gun holds one round per magazine and its total ammo count is 20 rounds.

Trivia
The M40's reload animation in Battlefield: Bad Company 2: Vietnam is similar to the M24's in the base game.