Review: H&K MARK23 The Civilian Version MK23 SOCOM -The Firearm Blog
Lobos Industries Mark 23 rail Adapter. I did not see this laser/light combo on the confirmed fit list, but here it is. It does fit without any troubles : r/HecklerKoch
Heckler & Koch - What is the best HK/Flashlight combo? Photo Credit: Stickman | Facebook
Firefly V2 Pistol Laser Light Combo | Red or Green | Tacticon
HK Mark 23 and a Laser/Light Combo - Saga | HKPRO Forums
Review: H&K MARK23 The Civilian Version MK23 SOCOM -The Firearm Blog