Changes
| '''Standard barrel''' || 8.9 inches || Muzzle: 3-lug mount || [[Heckler & Koch MP5A3]]<br/>[[Heckler & Koch MP5/10A3]]<br/>[[Heckler & Koch MP5/40A2]] || '''100''' || Original 8.9 inch barrel with 3-lug muzzle mount.
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| '''MP5 Sound Dampened (MP5SD)''' || 5.7 inches || Integral Muzzle: Integrated silencer || || '''900''' || Installs the MP5SD 5.7 inch integrally suppressed barrel, with matching handguards. This barrel does not have the original 3-lug muzzle interface.
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| '''Long barrel''' || 16.9 inches || Weight +1 tier<br/>Muzzle: 3-lug mount || || '''200''' || Installs a 16.9 inch HK94-style barrel. This long barrel possesses the original 3-lug mount, to retain compatibility.
