! Caliber !! Compatible magazines !! Corresponding base models
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| '''[[5.56x45mm NATO]]''' || [[STANAG magazines]] || [[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]]
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| '''[[6x45mm]]''' || [[STANAG magazines]] ||
| '''Rifle''' || 20 inches || Weight +1 tier<br/>Muzzle: Standard devices<br/>Bayonet compatibility: [[M9 bayonet]] || [[Colt AR-15A2 R6550]]<br/>[[Colt M16A1]]<br/>[[Colt M16A2]]<br/>[[Colt M16A4]] || '''600''' || Installs a 20 inch barrel, as originally intended for the platform.
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| '''Carbine''' || 14.5 inches || Muzzle: Standard devices<br/>Bayonet compatibility: [[M9 bayonet]] || [[Colt M4]]<br/>[[Colt M4A1]] || '''300''' || Installs an M4 style 14.5 inch barrel, which provides a compromise between performance and weight. Considered to be the modern standard length for AR-15 platforms.
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| '''Competition''' || 12.5 inches || Weapon becomes Class 2<br/>Muzzle: Standard devices || || '''600''' || Installs a short 12.5 inch barrel designed for competition shooting such as 3-gun.
| '''Safe/Semi/Auto''' || Semi/Full, AutoROF 8 || [[Colt M16A1]]<br/>[[Colt M4A1]]<br/>[[Colt Mark 18 Mod 0]] || '''400''' || Original select-fire trigger control group, with semi-auto and full-auto, no burst mode.
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| '''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.
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| '''Safe/Semi''' || Semi-auto<br/>Affects weapon category<sup>'''[[Maze Customs:Major mods#AR-15 weapon categorization|(*)]]''' || [[Colt AR-15A2 R6550]] || '''300''' || AR-15 style semi-automatic only trigger control group.
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
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| '''Original''' || Underbarrel: M203 mount (if barrel is '''DMR, Rifle, Carbine,''' or '''Commando''')<br/>Underbarrel: None {(if barrel is '''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]] || '''100''' || Original handguards with no features.
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| '''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.
| '''Fixed stock''' || '''S''' || None || [[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.
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| '''Retractable stock''' || '''RS''' || None || [[Colt M4]]<br/>[[Colt M4A1]]<br/>[[Colt Mark 18 Mod 0]] || '''400''' || M4 style retractable stock.
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| '''Folding stock adapter''' || '''FRS''' || None || || '''600''' || Installs a folding stock adapter on the buffer tube, which can accept standard retractable stock pieces, allowing the whole assembly to be both folding and retractable.
| '''Old style''' || Optics: N/A || [[Colt AR-15A2 R6550]]<br/>[[Colt M16A1]]<br/>[[Colt M16A2]] || '''200''' || Original style upper receiver with non-detachable carrying handle, and no mounting points for optics.
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| '''Flat top''' || Optics: NATO-S mount || [[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.
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| '''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.