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 7.62x51mm NATO rounds from a 5-round box magazine at an effective range of 1000 yards.

Battlefield Vietnam
The M40 is issued to USMC and MACV Scout 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 can somewhat be considered an equivalent to the Viet Cong M91/30.

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. 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.

Battlefield 3
"Developed around the Bolt-Action of a proven American hunting rifle, the M40A5 has been upgrade 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 equipped with a Rifle Scope (8x) by default."

- Battlelog description The M40A5 is a bolt-action rifle in Battlefield 3. It is issued to the Recon kit.

Singleplayer
During the campaign it is the starting weapon in Night Shift, it is equipped with a thermal vision 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
It is the fourth sniper rifle available for the Recon kit unlocked at 104,000 Recon score. Comes by default with a 8x Rifle Scope fitted and it only differs from the SV-98 in that it has a faster bolt cycle after shooting, has a faster reload and shoots slightly flatter at long range.

As of the recent large update, the M40A5 has had its damage changed and has a new chest multiplier of 1.25. This means that within its 80 damage range it will kill in one shot to the chest. It also means that in hardcore game modes, it will be able to kill in one shot to the chest at any range.

Videos
Video:M40|Gameplay with the M40 in Battlefield: Bad Company 2: Vietnam Video:Battlefield 3 M40A5 Wiki Video|Overview of the M40A5 in Battlefield 3.