Anti-reversal Latch: V2/3

Class 1: King arms

Class 2: SHS, ICS, Guarder

Class 3: Lonex, Modify, ASG, VFC

Class 4: Laylax

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Cylinder Head: V2

Class 1: A&K,

Class 2: ICS,

Class 3: Laylax, SHS, ZCI

Class 4: ASG, Lonex, MAXX model, 

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Gears: V2/3 15 tooth sector gear drive

Class 1: A&K, G&G

Class 2: SHS, ZCI, Lonex, Modify

Class 3: Laylax, G&P

Class 4: Siegetek

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Gear box: V2

Class 1: A&K

Class 2: 

Class 3: Lonex

Class 4: Retro Arms, SHS, Prowin

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Nozzle: Varying lengths

Class 1:

Class 2: Guarder, Retro Arms

Class 3: Lonex, Shs, Laylax

Class 4: 

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Piston: Standard 15 tooth

Class 1:

Class 2: SHS, Modify

Class 3: Lonex

Class 4: Laylax, systema

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Piston head: AeG Standard

Class 1:

Class 2: Shs, Bravo

Class 3: Lonex

Class 4: Action Army, Maxx Model, Laylax

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Spring: AEG standard

Class 1: G&G

Class 2: SHS, Action Army

Class 3: Laylax, ASG

Class 4:

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Spring guide: V2 (v3 in quick change design)

Class 1:

Class 2: SHS, Madbull, Maxx Model

Class 3: Lonex

Class 4: Laylax

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Trigger contacts: V2

Class 1:

Class 2: SHS

Class 3:

Class 4: Lonex