If anyone is looking for a decent budget light for a long gun, Midway has these Crimson Trace 500 lumen ones on sale for $30 with free shipping. This is the picatinny rail mount version. I just got mine today and I think it's solid. Comes with clicky cap and pressure switch (momentary and click button). Uses one CR123A battery (included). They have other versions available that are 900 lumen and take keymod/m-lok mounts, those are found on Optics Planet and Amazon though.
https://www.midwayusa.com/product/696545/crimson-trace-cwl-100-weapon-light-led-with-remote-switch-with-1-cr123a-battery-aluminum-black
https://www.midwayusa.com/product/696545/crimson-trace-cwl-100-weapon-light-led-with-remote-switch-with-1-cr123a-battery-aluminum-black