The grip attachment is available for all light machine guns and shotguns. It is unlocked when a player achieves 75 kills with a light machine gun, or 50 kills with a shotgun. Using the grip attachment will replace a player's tier one perk. The foregrip is most useful for LMGs, as they have moderate-high recoil; the grip helps to maintain accuracy when firing at range. The grip also tightens the hipfire spread on the M249 SAW.
The grip attachment is only available for the two shotguns, the Double-Barreled Shotgun and M1897 Trench Gun. It decreases weapon recoil just as in Call of Duty 4: Modern Warfare, and as previously, replaces the player's tier one perk. Instead of the synthetic polymer pistol grip from Modern Warfare, foregrips are basically wooden handles, finished and fashioned into sticks that simply attach to the gun's handguard. With this attachment, the Double-Barreled Shotgun has a small wood handguard under the barrels rather than a vertical grip.
Kill 10 enemy players (Lightmachine Guns) Kill 75 enemy players (Shotguns excluding Ranger and Model 1887)
The foregrip attachment is available for LMGs and Shotguns in Multiplayer. For LMGs, the foregrip is the first attachment unlocked for completing the Marksman I. For shotguns (except the Ranger and the Model 1887 because they cannot accept a foregrip) it is unlocked for completing Marksman III. When attached to a shotgun it reduces the recoil but the bullet spread remains the same. When on an LMG it greatly reduces recoil allowing for much greater accuracy. On moderate-high recoil LMGs such as the M240 or the L86 LSW the grip can be beneficial, as the recoil will keep climbing without it. It is also very common to see even the lower-recoil LMGs with the grip. Unlike Call of Duty 4: Modern Warfare and Call of Duty: World at War, the grip does not replace the Tier 1 perk. Though this is not possible in multiplayer, the SCAR-H can be found with a foregrip in The Pit in "S.S.D.D." and used by Army Rangers in the Campaign. The Grip also decreases the raise time for the AA-12. Almost all of the weapons use the same model for the foregrip.
The grip attachment returns in "Call of Duty: Black Ops". It can be mounted on the M60, the M14, the Stakeout and every submachine gun except the MP5K. For most weapons, attaching a grip instead attaches a stock, as seen on every SMG apart from the AK-74u that has a foregrip. On sub-machine guns with preexisting stocks like the Uzi, the stock will be folded when Grip is not used and will be unfolded when Grip is used. When attached to the Stakeout, its fire rate will be slightly increased.
The Grip increases a weapon's centerspeed by 25% and reduces view kick by 10%, again effectively lowering recoil for weapons. Also, with the new Kick Proficiency, players can combine the Grip with Kick to further decrease recoil. It is unlocked for shotguns at Weapon Proficiency Level 2 and LMGs at Weapon Proficiency Level 8. It should be noted that because the Grip doesn't affect gun kick, it does not provide as much recoil reduction as the Kick proficiency on weapons with high gun kick like the L86 LSW. The Grip provides much better recoil reduction than the Kick proficiency on weapons with low gun kick like the M60E4.
Grip is functionally the same in Survival Mode and available for the same weapon groups. It is available from level 19 and costs $1250. It is highly recommended use this with all light machine guns, and fast firing shotguns, like the Striker and the AA-12.
The Grip's function in Black Ops II has been altered from past titles. It now adds +2% to all weapons' view kick centerspeed apart from the SMG category, to which it adds only +1.5%. The effect is significantly smaller than previous versions of the attachment, likely to balance it with the other available attachments. The Grip's recoil reduction stacks with the ACOG Scope (+2%) and the EOTech Sight (+1%).
Throughout the Call of Duty series, a handful of weapons can be found that have a grip attached even without any attachments.
In Call of Duty 4, Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare 3, the M4A1 will always have a grip attached, unless an underbarrel attachment is equipped. Attaching FMJ to the M4A1 will make the grip disappear; however, it is still held as if the grip was still attached.
In all Call of Duty games, when the grip is attached while in third person view, it can be seen, but the gun will be held as if it didn't have one.
In Call of Duty: Black Ops, the PM63 is uniquely named "PM63 Folding Stock" in game when equipped with the Grip attachment.
In the game files exist two grips: "menu_mp_weapons_attach_grip" and "menu_mp_weapons_attach_grip_folding", both with the same image, possibly suggesting another grip type that was cut, or to match the functionality of the SMG grips.