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The AAC Integrally Suppressed Remington 700 is an American sniper rifle manufactured by Remington Arms. It is a modification of the R700 that has an integrally suppressed barrel. It appears in Battlefield Hardline as the .300 Knockout, where it fires the .300 Blackout round.
"The .300 KO is an integrally suppressed sniper rifle that fires a special short distance round that reduces audible signature. The downside is you can't take the silencer off... but why would you want to?"
— In-game description
The .300 Knockout is an unlockable weapon for the Professional kit. It is the Professional's Syndicate weapon, requiring the completion of the Professional Syndicate assignment to unlock.
It is distinct from the Professional's other rifles in that it is integrally suppressed, meaning it has a permanently attached Suppressor. This gears it more towards close and medium range engagements, as the suppressor causes a large amount of drop compared to the other rifles. However, it still has very high damage, allowing it to still perform effectively at long range if the player accounts for bullet drop.
Once the gun is obtained, it comes equipped with a FLIR and Laser Sight by default, with the ACOG also unlocked.