Airtac GHK M4 / G5 to MP5 HPA Adapter — Non-Prebuilt

The Airtac GHK M4 / G5 to MP5 HPA Adapter is a compact, non-prebuilt upgrade designed for the GHK G5 mag-well. It exposes only the CNC aluminium mag release paddle and the US-style HPA fitting, delivering reliable semi-auto performance with CYMA MP5 mid caps.

• Low-profile CNC aluminium build: Sits inside the GHK G5 mag-well and reveals only the mag release paddle and HPA fitting for a streamlined, snag-free profile.
• Replaceable feed tube: Feed tube can be swapped; a donor mag is required for lips, exhaust valve, and gas route—allowing tailored feeding reliability.
• Compatibility with CYMA MP5 Mid Caps: Supports 65-round metal, 120/130-round metal, Straight, Novritsch Straight, and Bullet Window magazines; straight mags follow the pistol/SMG grip.
• Correct feed lip version: Features the two side wings on the lips as pictured to ensure proper feeding; refer to the product images for the correct alignment.
• Performance specs: Rated around 350fps at 105psi; designed for consistent semi-auto cycling; full-auto may be limited due to reduced internal volume.
• Installation notes: Requires a GHK valve key for home installation; feed lip pins must be glued in place for a secure fit; includes a CNC valve collar for a reliable air seal.
• Practical usage: Best suited for semi-auto gameplay where feeding is consistently reliable; initial magazine insertion will be snug to ensure a perfect fit and minimal BB loss (about 2 BBs on change); gas magazines for this adapter are not provided.

With the Airtac GHK M4 / G5 to MP5 HPA Adapter, you gain a compact, dependable HPA setup that preserves the GHK G5 feel while delivering steady semi-auto performance across CYMA MP5 mid caps. The replaceable feed tube and precise feed lips help reduce misfeeds, and the low-profile design keeps handling smooth in close-quarters engagements. This solution is ideal for players who value trigger response consistency and field-friendly ammo efficiency, especially when using compatible mid-cap magazines. Note that installation requires a GHK valve key, and gas magazines are not included.