The new way to run HPA on your Hi-Capa! 

Contains the HPA module and hammer spring housing + associated screws / pins. You will need to purchase magazines separately if you buy this pack

What are SIM MAGS?

The Airtac SIM Mags essentially split a traditional gas magazine in two. The gas section of the magazine is held in place in the pistol (no modification required) using the hammer spring housing and grip screws. By using HPA in place of green gas, shot to shot consistency is incredible.

The BB section being separate allows for lightweight, lower cost 30rnd magazines, while retaining the features and aesthetic of GBB pistols that we all know and love.

Slide Lock is back! Welcome a fun mechanic back into your playstyle. Still want to short stroke, that's not a problem with our SIM-SLIDES, which move the slide lock catch forwards.

Installation Video and Quick Demo

Note - screws are now stainless and no washer is required

Requires gas router and a WE or TM 5.1 Valve from a donor gas magazine. Hammer Spring from your pistols Hammer Spring Housing