Features: Attachment: M1913/Picatinny Rails or Weaver Rails Activation: Tap On, Tap Off Auto shut-off: 5 minutes Material: Polymer Master On/Off Switch: No Beam intensity: 100 lumens Light source: LED Battery Life: 2 Hours Battery Type: CR2 Lithium (1) Light Modes: Constant On/Off, Momentary Strobe, Momentary On Fits: 1911 Government or Commander with Rail AR-15/M16 or similar rail-equipped long guns Beretta PX4 Full Size and Compact, 92 Vertec GLOCK 3rd Gen 17, 19, 20, 21, 22, 23, 31, 32, 34, 35, 38 GLOCK 4th Gen 17 and 19 Heckler & Koch (HK) P30, 45, 45C Ruger SR9, SR40, SR9c, SR40c Sig Sauer P220, P226, P229 Smith & Wesson M&P Full-Size and Compact Smith & Wesson SD Springfield Armory XD and XD(M) Taurus Millennium Pro, 24/7 Most other rail-equipped pistols with a minimum of 1 1/16" from recoil lug.