| '''Safe/Semi/Burst''' || Semi/Burst3 || [[Colt M16A2]]<br/>[[Colt M16A4]]<br/>[[Colt M4]] || '''400''' || M16A2 style trigger control group, featuring semi-auto and 3-round burst, no full-auto.
|-
| '''Safe/Semi''' || Semi-auto<br/>Affects weapon category<sup>'''[[Maze Customs:Major mods#AR-15 weapon categorization|(*)]]''' || [[Alexander Arms AWS]]<br/>[[Colt AR-15A2 R6550]] || '''300''' || AR-15 style semi-automatic only trigger control group.
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| '''Safe/Auto''' || Full-auto only, AutoROF 8 || || '''400''' || M16 LMG-style, full-auto only fire control group. Ideal for builds intended to use large magazines.
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Original''' || Underbarrel: M203 mount (if barrel is '''DMR, Rifle, Carbine,''' or '''Commando''')<br/>Underbarrel: None (if barrel is '''Sport carbine''', '''Competition''' or '''Subcarbine''') || [[Colt AR-15A2 R6550]]<br/>[[Colt M16A1]]<br/>[[Colt M16A2]]<br/>[[Colt M16A4]]<br/>[[Colt M4]]<br/>[[Colt M4A1]]<br/>[[Colt Mark 18 Mod 0]]<br/>[[Colt XM177E2 Commando]] || '''100''' || Original handguards with no features.
|-
| '''Quad rails''' || Lights: 2x Long interface<br/>Underbarrel: Long interface || || '''600''' || Quad-rail handguards to attach the lights, lasers, and underbarrel accessories of your choice.
! Configuration name !! Stock type !! Other effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Fixed stock''' || '''S''' || None || [[Alexander Arms AWS]]<br/>[[Colt AR-15A2 R6550]]<br/>[[Colt M16A1]]<br/>[[Colt M16A2]]<br/>[[Colt M16A4]] || '''150''' || Fixed nonadjustable stock, in the style of the original M16 rifles.
|-
| '''Retractable stock''' || '''RS''' || None || [[Colt M4]]<br/>[[Colt M4A1]]<br/>[[Colt Mark 18 Mod 0]]<br/>[[Colt XM177E2 Commando]] || '''400''' || M4 style retractable stock.
| '''Old style''' || Optics: N/A || [[Colt AR-15A2 R6550]]<br/>[[Colt M16A1]]<br/>[[Colt M16A2]]<br/>[[Colt XM177E2 Commando]] || '''200''' || Original style upper receiver with non-detachable carrying handle, and no mounting points for optics.
|-
| '''Flat top''' || Optics: NATO-S mount || [[Alexander Arms AWS]]<br/>[[Colt M16A4]]<br/>[[Colt M4]]<br/>[[Colt M4A1]] || '''600''' || Modern upper receiver with a length of NATO-S rail for mounting optics. Comes with a detachable carrying handle with adjustable rear iron sights.
|-
| '''DMR''' || Optics: Integrated 3x scope<br/>Affects weapon category<sup>'''[[Maze Customs:Major mods#AR-15 weapon categorization|(*)]]''' || || '''600''' || Special upper receiver featuring a proprietary ART II 3x scope, in the style of the Colt Model 656.