Mark 23 DA/SA two 10rd magazines – Threaded O-ring barrel with polygonal bore profile – Match grade trigger – One piece machined steel slide – Frame mounted decocking lever and separate ambidextrous safety lever – Can be carried “cocked and locked” in single action mode with the safety lever on – Patented HK recoil reduction system – Corrosion resistant blued finish – Corrosion proof fiber-reinforced polymer frame – Oversized trigger guard for use with gloves – Universal mounting grooves for installing accessories – Ambidextrous magazine release lever – Extended slide release – Extractor doubles as a loaded chamber indicator – Patented Lock-Out Safety device