I looked everywhere and did lots of work to get this light, now I don't like it on my 870... It is the one that takes P series bulbs and has thumb screws. This one has the rare rubber push button only tailcap. The light has lots of wear, but works perfect and has a lifetime warranty. Asking $120 obo. Trades I'm interested in are - RUGER 10/22, Qualoty fixed blades, other Surefire lights, quality backpacks, NIB Glock 26 nightsights, and other cool ish. I will text or email pics. I did a little research, I think it is a M951 with the push button only tail cap, which I've been tools go for $75 alone on AR15.com.