|-
| '''Ported barrel''' || [[Recoil]] -1<br/>[[Weapon accessories#Silencers|Silencers]] are rendered ineffective || || '''450''' || See [[Maze Customs:Major mods#Notes|note 1]]
|}
'''Barrel threading type'''
{| class="wikitable sortable" style="font-size:9pt"
|-
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''No threading''' || Muzzle: None || [[Colt Delta Elite]]<br/>[[Colt M1911A1]]<br/>[[SIG 1911FN]]<br/>[[Springfield 1911RO]] || '''50''' || Original barrel profile with no threading.
|-
| '''Standard threading''' || Muzzle: Standard devices || || '''150''' || Modern muzzle threading system for mounting Standard muzzle devices.
|}
|-
| '''Ported barrel''' || [[Recoil]] -1<br/>[[Weapon accessories#Silencers|Silencers]] are rendered ineffective || || '''450''' || See [[Maze Customs:Major mods#Notes|note 1]]
|}
'''Barrel threading type'''
{| class="wikitable sortable" style="font-size:9pt"
|-
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''No threading''' || Muzzle: None || [[Para P-14]]<br/>[[Para P-16]]<br/>[[Para P-18]] || '''50''' || Original barrel profile with no threading.
|-
| '''Standard threading''' || Muzzle: Standard devices || || '''150''' || Modern muzzle threading system for mounting Standard muzzle devices.
|}
! Configuration name !! Barrel length !! Other effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Snub-nose''' || 2.5 inches || Weight -2 tiers || || '''500''' || Installs a short 2.5 inch barrel with corresponding front sight.<br/>'''Not compatible''' with: '''Integrated scope''' and '''Scope rail''' optics
|-
| '''Vaquero''' || 4.62 inches || Weight -1 tier || || '''400''' || Installs a medium-length 4.62 inch barrel with corresponding front sight, patterned after the [[Ruger Vaquero]].
|-
| '''Super Buntline''' || 12.5 inches || Weight +1 tier || || '''500''' || Installs a super-long 12.5 inch barrel with corresponding front sight, inspired by the [[Buntline Special]].
|}
'''Barrel porting'''
{| class="wikitable sortable" style="font-size:9pt"
|-
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Unported barrel''' || None || [[Ruger Blackhawk]]<br/>[[Ruger Super Blackhawk]] || '''50''' || Original, unmodified barrel.
|-
| '''Ported barrel''' || [[Recoil]] -1 || || '''350''' || See [[Maze Customs:Major mods#Notes|note 1]]
|}
| '''[[.357 Magnum]] / [[.38 Special]]''' || <center>[[File:No box.png|25px]]</center> || 5 rounds<br/>6 rounds<br/>7 rounds<br/>8 rounds ||
|-
| '''[[.38 Special]] only''' || <center>[[File:No box.png|25px]]</center> || 5 rounds<br/>6 rounds<br/>7 rounds<br/>8 rounds || .
|-
| '''[[.357 SIG]]''' || <center>[[File:Yes box.png|25px]]</center> || 5 rounds<br/>6 rounds<br/>7 rounds ||
! Configuration name !! Barrel length !! Other effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Snub-nose''' || 2.5 inches || Weight -2 tiers || [[Ruger Super Redhawk Alaskan]] || '''500''' || Installs a short 2.5 inch barrel with corresponding front sight.<br/>'''Not compatible''' with: '''Integrated scope''' and '''Scope rail''' optics
|-
| '''Combat''' || 4.25 inches || Weight -1 tier || || '''400''' || Installs a medium-length 4.25 inch barrel with corresponding front sight, patterned after the [[Ruger Vaquero]].<br/>'''Not compatible''' with: '''Integrated scope''' and '''Scope rail''' optics
|-
| '''Standard''' || 7.5 inches || None || [[Ruger Redhawk]]<br/>[[Ruger Super Redhawk]] || '''200''' || Installs a long 7.5 inch barrel with corresponding front sight.
|-
| '''Super Buntline''' || 12.5 inches || Weight +1 tier || || '''500''' || Installs a super-long 12.5 inch barrel with corresponding front sight, inspired by the Buntline Special.
|}
'''Barrel porting'''
{| class="wikitable sortable" style="font-size:9pt"
|-
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''Unported barrel''' || None || [[Ruger Redhawk]]<br/>[[Ruger Super Redhawk]]<br/>[[Ruger Super Redhawk Alaskan]] || '''50''' || Original, unmodified barrel.
|-
| '''Ported barrel''' || [[Recoil]] -1 || || '''350''' || See [[Maze Customs:Major mods#Notes|note 1]]
|}
|-
| '''Ported barrel''' || [[Recoil]] -1<br/>[[Weapon accessories#Silencers|Silencers]] are rendered ineffective || [[Glock 18C]] || '''450''' || See [[Maze Customs:Major mods#Notes|note 1]]
|}
'''Barrel threading type'''
{| class="wikitable sortable" style="font-size:9pt"
|-
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''No threading''' || Muzzle: None || [[Glock 17]]<br/>[[Glock 18C]]<br/>[[Glock 22]]<br/>[[Glock 31]] || '''50''' || Original barrel profile with no threading.
|-
| '''Standard threading''' || Muzzle: Standard devices || || '''150''' || Modern muzzle threading system for mounting Standard muzzle devices.
|}
| '''Ported barrel''' || [[Recoil]] -1<br/>[[Weapon accessories#Silencers|Silencers]] are rendered ineffective || || '''450''' || See [[Maze Customs:Major mods#Notes|note 1]]
|}
'''Barrel threading type'''
{| class="wikitable sortable" style="font-size:9pt"
|-
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''No threading''' || Muzzle: None || [[Glock 20]]<br/>[[Glock 21]] || '''50''' || Original barrel profile with no threading.
|-
| '''Standard threading''' || Muzzle: Standard devices || || '''150''' || Modern muzzle threading system for mounting Standard muzzle devices.
|}
=== Fire control (Glock-LF) ===
| '''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.
|-
| '''Short MP5K barrel''' || 4.5 inches || Muzzle: N/A<br/>Underbarrel: Integrated foregrip<br/>May affect weapon category and class<sup>'''[[Maze Customs:Major mods#MP5 weapon categorization|(*)]]''' || [[Heckler & Koch MP5K]] || '''150''' || Installs the MP5K 4.5 inch barrel with no muzzle mounting point and the unique integrated foregrip.<br/>'''Not compatible''' with: '''Surefire 628''' and , '''Quad rails''', and '''ISL-201''' handguards
|-
| '''MP5 Sound Dampened (MP5SD)''' || 5.7 inches || Muzzle: Integrated silencer || || '''900''' || Installs the MP5SD 5.7 inch integrally suppressed barrel, with matching handguards.
|-
| '''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.<br/>'''Not compatible''' with: '''ISL-201''' handguards
|}
|-
| '''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.<br/>'''Not compatible''' with: '''Short MP5K barrel'''
|-
| '''ISL-201''' || Underbarrel: Integrated [[ISL-201 UGL-I]] grenade launcher || || '''800''' || Unique dedicated handguard with integrated ISL-201 40mm grenade launcher.<br/>'''Not compatible''' with: '''Short MP5K barrel''' and '''Long barrel'''
|}
| '''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<br/>(or '''NATO mount''' if the '''Quad rails''' are also installed) || [[Alexander Arms AWS]]<br/>[[Colt M16A4]]<br/>[[Colt M4]]<br/>[[Colt M4A1]]<br/>[[Colt Mark 18 Mod 0]] || '''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.<br/>If paired with the quad rails, the top rail section serves as an extension of your flat top, giving you a full-length NATO rail.
|-
| '''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.
| '''Rifle''' || 16.3 inches || Bayonet compatibility: [[6X5 AK bayonet]] || [[AKM]]<br/>[[AKMS]]<br/>[[AK-74]]<br/>[[AKS-74]]<br/>[[AK-101]]<br/>[[AK-103]]<br/>[[AK-12-1]]<br/>[[AK-12-2]]<br/>[[AK-12-3]]<br/>[[Saiga SGL31-61]] || '''300''' || Installs a standard rifle-length 16.3 inch barrel.
|-
| '''Carbine''' || 12.4 inches || Weapon becomes Class 2<br/>Weight -1 tier || [[AK-102]]<br/>[[AK-104]]<br/>[[AK-105]] || '''600''' || Installs a short 12.4 inch barrel, as introduced by the carbine-length AK-100 models.<br/>'''Not compatible''' with: '''Bipod''' handguard configuration|-| '''Subcarbine''' || 8.1 inches || Weapon becomes Class 2<br/>Weight -2 tiers || [[AKMSU]]<br/>[[AKS-74U]] || '''800''' || Installs a very short 8.1 inch barrel, alongside the AKS-74U style receiver, dust cover and rear sight, minimizing size and weight at the expense of ballistic performance.<br/>'''Not compatible''' with: '''Bipod''' handguard configuration
|-
| '''Subcarbine''' || 8.1 inches || Weapon becomes Class 2<br/>Weight -2 tiers || [[AKMSU]]<br/>[[AKS-74U]] || '''800''' || Installs a very short 8.1 inch barrel, alongside the AKS-74U style receiver, dust cover and rear sight, minimizing size and weight at the expense of ballistic performance.
|}
| '''Foregrip''' || Underbarrel: Integrated foregrip || [[AKMSU]] || '''400''' || Installs specially shaped foregrip handguard, such as those found on the [[AKMSU]].
|-
| '''Bipod''' || Underbarrel: Integrated bipod. '''Not compatible''' with: '''Carbine''' or '''Subcarbine''' barrel configurations || [[RPK]]<br/>[[RPK-74]] || '''400''' || Installs a folding bipod, as well as handguard resembling the regular ones, but with a cutout to accomodate for the bipod when folded.<br/>'''Not compatible''' with: '''Carbine''' or '''Subcarbine''' barrel configurations
|-
| '''Railed''' || Lights: 2x Long interface<br/>Underbarrel: Long interface || [[AK-12-1]]<br/>[[AK-12-2]]<br/>[[AK-12-3]] || '''600''' || Plastic handguard with accessory rails, as seen on the [[AK-12]].
If your current configuration includes the '''Rifle''' barrel with '''Regular''' handguard, your weapon is compatible with both the [[GP-30]] UGL and [[6X5 AK bayonet]]. However, '''they cannot be mounted together at the same time'''; you must attach one or the other.
= AR-10 =
|-
| '''XM3 barrel''' || 18.5 inches || Weight tier -1 || || '''600''' || Installs a special purpose 18.5 inch barrel, meant to reduce overall length and weight without sacrificing too much performance.
|}
'''Barrel threading type'''
{| class="wikitable sortable" style="font-size:9pt"
|-
! Configuration name !! Effects !! Corresponding base models !! Cost ([[File:Parallar symbol.png|10px]]) !! Description
|-
| '''No threading''' || Muzzle: None || [[Remington Model 700 XCR II]]<br/>[[Remington Model 700 ADL]]<br/>[[Remington Model 700 BDL]]<br/>[[Remington M24]] || '''100''' || Original barrel profile with no threading.
|-
| '''Standard threading''' || Muzzle: Standard devices || || '''200''' || Modern muzzle threading system for mounting Standard muzzle devices.
|}