Redline N7 Engine HPA Conversion Kit

Style: M4
Sale price$ 294.95

Pickup available at Gilbert Arena

Usually ready in 24 hours

This system is designed for outdoor use. If you purchase this with the intention of using it in an indoor environment, you may have issues. This is because this design has fixed chamber that isn't designed to be adjusted.  DO YOUR RESEARCH or ask our staff for any questions you may have. 


  • True closed bolt, fully mechanical HPA cylinder replacement
  • True weatherproof design with no battery or FCU needed
  • Super easy setup, little to no tuning required
  • Easy hop tuning do to its true closed bolt design
  • Fixed area dump chamber design
  • Less "joule creep" than typical HPA engines
  • 100% designed and manufactured in the USA


The Redline N7 Milsim Gen-2 is a Patent Pending HPA drop in cylinder replacement system. It is an updated version of our legendary N7 Milsim, the very first fully mechanical, true closed bolt HPA engine.

Like the original N7 Milsim, the N7 Milsim Gen-2 has a forward biased nozzle, fires from a true closed bolt and has fully mechanical operation. No battery or FCU needed!

The N7 Milsim Gen-2 also comes with our new Enhanced Trigger Valve. The Enhanced Trigger Valve features a short crisp trigger pull, a "break" at the release point and a reset action on the release. There is no cross bleed of air when the trigger is pulled slowly, so no matter how you pull the trigger, you get consistent trigger action.

The most noticeable change from the original N7 is the elimination of the external airline to the nozzle. We have also updated the internal components and slightly reduced the size of the air chamber. Functionally however, it is identical to the original N7 Milsim. Meaning you get the same great performance and easy setup that the original N7 engines were known for.

Due to its true closed bolt design and air balanced nozzle return, the N7 Milsim Gen-2 is much more consistent in seating the BB in the bucking from shot to shot when compared to a typical open bolt HPA engine. The result is more consistent shot to shot velocity, tighter groupings and greater accuracy at range when compared to open bolt HPA engines.

Just like the original N7 the N7 Milsim Gen-2 uses a mechanically sealed, dump chamber. Rather than relying on solenoid dwell to control the volume of air used to propel the BB, the N7 Gen-2 fills an internal air chamber at the pressure set by the users external supply regulator.

When fired, this air chamber is mechanically sealed off from the supply and the chambers contents is released down the barrel to propel the BB. This feature contributes to the N7 Milsim Gen-2s excellent shot to shot consistency.

The N7 Gen-2 is super simple to set up. Since there is no poppet dwell to tune you simply set your supply regulators output pressure to match the Joules required and you are good to go.

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