Just last week, Infinity Ward released the mid-season update for Call of Duty: Modern Warfare that brought in a new weapon, new multiplayer map and more. Apparently, it also included a Modern Warfare Merc foregrip buff that made movement speed faster when it’s equipped on a weapon!

This buff follows Infinity Ward’s stealth changes (undocumented changes) that have been present in almost every patch the developer has released for the game so far. In case you didn’t know, the Merc foregrip underbarrel attachment helps with recoil control and hipfire accuracy at the expense of slower ADS (aim down sight), and movement speed. It seems that after last week’s 1.23 update, Infinity Ward has not only taken out the movement speed penalty, but gave it a buff, even! Check out the official, in-game pros and cons of the attachment below.

YouTuber Xclusive Ace and Drift0r have both published videos showcasing the evidence that this Modern Warfare Merc foregrip buff is indeed real. Based on data, players can run four percent faster with the Merc foregrip equipped on any gun. Yes, that means you can add the Merc foregrip to assault rifles, SMGs (submachine guns), etc. and it will give you a four percent speed boost!

Here’s Ace’s rundown of the movement buff and penalties for the different foregrip attachments in the game:

And for those curious, this buff works in Call of Duty: Warzone too! Now, there’s no reason not to use the attachment given not only does it help with recoil and hipfire accuracy, it now adds a movement speed bonus as well. It’s unknown whether this was intentionally made by Infinity Ward or a bug that surfaced because of the weapon balancing pass they made in the patch.

For now though, go use the Merc foregrip in every gun you can, and thank us later.