Kross Airsoft Design MK23 / SSX23 HPA MP5 Magazine Adapter

The MK23 and ASG SSX23 share the same magazine architecture, which means accessories that fit one fit the other. KAD's MP5 HPA adapter takes both platforms onto MP5 magazines, where capacity jumps from the stock 28-round mag to 100+ rounds per stick — game-changing for skirmish use.

Three packages cover every comfort level. The bare Adaptor Only kit is for techs who'll source their own donor and handle the install themselves. Fully Assembled arrives ready to use. Send Us Your Mag means you post us your existing magazine and we fit the conversion for you and ship it back ready to use.

Mag choice matters more than you'd think

KAD specifically recommend CYMA metal mid-cap MP5 magazines for the cleanest feed. Cheaper polymer mids can have inconsistent internal dimensions that cause feeding stutters under HPA pressure, and high-caps don't suit the constant-feed nature of HPA at all. If you're going Adaptor Only, source CYMA mids before you start the build.