Retro Arms CNC Trigger M4, Type J, Black

The Retro Arms CNC Trigger M4, type J, is a CNC-machined trigger for the AR-15/M4 platform from Czech manufacturer Retro Arms. Type J has a distinctive angular profile with a flat face and a pronounced hook at the bottom that gives the finger a firm reference point.

Retro Arms is known for CNC gearboxes, receivers and gearbox parts, and their triggers are a simple way to get a more precise and personal trigger feel. A CNC-machined trigger has tighter tolerances than the cast factory parts in many AEGs, and the black finish blends discreetly into most M4 builds.

Why choose the Retro Arms type J

What the trigger gives you:

• CNC-machined: Machined on a CNC machine to tight tolerances rather than cast, so the fit in the gearbox and the break point are more consistent.
• Type J profile: The flat face and pronounced hook at the bottom give a firm, repeatable finger placement – especially welcome for fast semi-auto shots.
• For AR-15/M4: Made for the AR-15 platform, the most widespread AEG type, and therefore relevant to many replicas.
• Low weight: At approx. 4 g it is light and doesn't affect the return of the trigger spring.
• Czech manufacturer with warranty: Retro Arms manufactures in-house in the Czech Republic and gives a 24-month warranty on the part.

Maintenance and safety

• The trigger is fitted inside the gearbox – this requires disassembly and knowledge of the trigger contact and cut-off.
• Check that the trigger activates the contact correctly and returns freely before closing the gearbox.
• Always remove the battery and empty the magazine before opening the replica.
• Our workshop in Aulum, Denmark can fit the trigger for you.