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.
SCAR-H with the Foregrip attachment, only seen in single player.
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. An exception to this is the Skorpion on the Nintendo Wii build of the game, where a conventional grip is used over its wire stock. 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 KickProficiency, 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%), as well as with the increased centerspeed when firing in burst mode using Select Fire.
The Grip appears in Call of Duty: Ghosts' multiplayer. It reduces view kick by 10%. It is available on Assault Rifles, Submachine Guns, Light Machine Guns, and Shotguns, as well as being an integral attachment to the MR-28Marksman Rifle. This makes the grip in Ghosts compatible with the most weapon classes and the most weapons in any single game thus far. It has been significantly improved in relation to its Black Ops II counterpart, now noticeably decreasing recoil on all weapons it's compatible with. On shotguns, like in previous games, recoil is reduced but pellet spread remains the same. All in all, the grip in Ghosts is a very worthwhile attachment on both higher recoil weapons to increase their accuracy and lower recoil weapons to reduce their recoil even further.
In multiplayer, the Foregrip can be mounted to all assault rifles, submachine guns (except the SAC3), shotguns and heavy weapons (except the XMG and Ohm). It decreases viewkick by 10% and increases centerspeed by 10% across all weapons. The effect is much more noticeable on high recoil weapons such as the HBRa3 and the EM1, and less noticeable on low recoil weapons such as the AK-12 and the ARX-160.
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 in Modern Warfare 2 will make the grip disappear; however, it is still held as if the grip was still attached. In Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare 3, the Striker will always have a grip equipped, and the first person model will always have the left arm gripping it. In Call of Duty: Black Ops, the AUG will always have a grip attached, and the model will always have the left arm gripping it, even though the grip attachment isn't available for the weapon. In Call of Duty: Modern Warfare 3, the PM-9 has a uniquely shaped, built-in grip, but since the PM-9 is always held with one hand in first person view, it is never visually held. In Call of Duty: Advanced Warfare, the AE4, the Speakeasy variant of the ASM1, the MDL and Ohm have built-in grips which are only for aesthetic purposes. Grips can be equipped to the AE4 and ASM1 Speakeasy.
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.