A few years back I bought an AR and it came with an optic. One I never would have considered purchasing separately for myself. That optic was the TRS-25. Mine came without the riser, but I've read that they're not that great anyway. I picked up a cheap 3/4" riser and it's worked fine for me. You can get it here for under $100 - http://shop.opticsplanet.com/bushne...plusbox-beta&gclid=CK_I3cbX_NECFVaBswodfgcKhQ There's not really much to say about it, other than it just works. I've never had it lose zero, and the battery life is pretty good. I left it on (level 4 out of 11) and it finally died after about 8 months. That's not Aimpoint type battery life, but it's also not Aimpoint money. I've used this on several rifles while trying to figure out what to do with them. It hasn't given me a single issue.