! Configuration name !! Fire modes !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''SEF''' || Semi/Full, AutoROF 7 || [[Heckler & Koch MP5A3]]<br/>[[Heckler & Koch MP5/10A3]]<br/>[[Heckler & Koch MP5/40A2]]<br/>[[Heckler & Koch MP5K]] || '''250''' || Original select-fire trigger control group, with semi-auto and full-auto, no burst mode.
|-
| '''0-1''' || Semi-auto<br/>Weapon category becomes '''Conventional rifle''' || || '''250''' || Semi-automatic only trigger control group, transforms the weapon into a pistol-caliber carbine.
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Original''' || None || [[Heckler & Koch MP5A3]]<br/>[[Heckler & Koch MP5/10A3]]<br/>[[Heckler & Koch MP5/40A2]]<br/>[[Heckler & Koch MP5K]] || '''100''' || Original handguards with no specific features.
|-
| '''Surefire 628''' || Lights: Integrated weaponlight || || '''300''' || Special handguards with an integrated Surefire 628 light and appropriate on/off buttons. Sits low enough to avoid interfering with suppressors or muzzle brakes.<br/>'''Not compatible''' with: '''Short MP5K barrel'''
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Original''' || Optics: HK-S mount || [[Heckler & Koch MP5A3]]<br/>[[Heckler & Koch MP5/10A3]]<br/>[[Heckler & Koch MP5/40A2]]<br/>[[Heckler & Koch MP5K]] || '''100''' || Original receiver, which can be fitted with claw-mounted (HK-S) optics.
|-
| '''Tactical''' || Optics: NATO-S mount || || '''300''' || The receiver is fitted with a short optics rail, capable of accepting NATO-S optics.
| '''UMP stock''' || '''FS''' || None || || '''150''' || [[UMP]]-style folding stock.
|-
| '''Endcap''' || '''N''' || Weight tier -1<br/>May affect weapon category and class<sup>'''[[Maze Customs:Major mods#MP5 weapon categorization|(*)]]''' || [[Heckler & Koch MP5K]] || '''100''' || No stock at all. The rear of the receiver is simply covered by an endcap with a sling loop.
|}