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The GG&G HK MK 23 light and laser mount is the the easy and rock sold way to mount a light or laser to your HK MK23.
MK23/SSX23 to MP5 HPA Adapter — Airtac UK
MK23 STTI - MP5 Adapter
STL file MK23 TO M4 HPA ADAPTER・3D printer model to download・Cults
MK23 / SSX23 HPA/M4 adapter with magazine – Primary Airsoft
Accessories For New Mark 23 (Light and Suppressor Choices) | HKPRO Forums
SOLD Primary Airsoft Adapter for MK23 | HopUp Airsoft