Kross Airsoft Design MK23 / SSX23 HPA M4 Magazine Adapter

If you've got an MK23 or SSX23 in your kit and a stack of M4 mags from a primary rifle, this adapter is the part that lets the pistol borrow from the same mag pool. The conversion replaces the gas system entirely — your pistol now runs from constant HPA pressure off the same M4 mags as your rifle, with all the capacity and consistency advantages that brings.

Three options to suit how much you want to do yourself. Adaptor Only is the kit-of-parts approach for tinkerers who'll handle their own donor install. Fully Assembled is the buy-and-go option, fitted around a TM-spec mag. The middle path — post your existing magazine to us and we'll handle the conversion before sending it back.

Why M4 over MP5 for some builds

Both M4 and MP5 mag conversions exist for the MK23/SSX23 platform. The choice usually comes down to ergonomics — M4 mags sit straight down from the gun, which suits prone shooting and DMR-style use. MP5 mags angle slightly forward and have a different gripping profile. If you primarily run prone or supported, M4 is generally the better pick.