a few links for ya.
www.bushmaster.com/shopping/scopes/arms39.aspwww.bushmaster.com/shopping/scopes/ksn-m16.aspwww.bushmaster.com/shopping/scopes/arms5.aspwww.bushmaster.com/shopping/scopes/5855-01-299-777.aspthese are for mounts. as for scopes I would have to say that you need to spend in the range of $60+ to get anything other than crap. after that its all about features.
ask yourself some questions. 1. what kind of scope do i want? A short range scope? a short-medium range scope? or a long range scope? considering the average range of the AR15 you would need a short-medium range scope.
2. what size? well it doesn't need to be bulky thats for sure. it also shouldn't be very LONG.
3. what adjustment level do I want? 1/2 moa? 1/4 moa? IMHO id want to be able to do micro adjustments to get my gun right on target.
generally speaking if you want to hit a penny at average shooting range then get a scope with 1/4 moa or less (if they make em lower?) but if your trying to hit just a general spot about the side of a baseball or larger then you can go with higher.
4. what quality. this is a no-brainer you want water proof, shock proof, fog proof lenses with some good covers. you also want a good warranty.
5. electric?,NV?,illuminated reticle?
do you want any of these features? as a scope user I know that these things are not neccesity. Although the NV and Illuminated reticule ones would help in low light conditions. Although a NV scope would cost an arm and a leg (usually over a $1000!!!) an illuminated reticule scope would cost considerably less although still not dirt cheap.
seems like Leupold has some good tactical scopes for short-medium range.
compacts:
www.leupold.com/pishot.htmlthe mk 4 cqt
www.leupold.com/pi_cqt.htmlavailable at bushmaster...
www.bushmaster.com/shopping/scopes/m4-cqt.asptacticals
www.leupold.com/pilaw.htmlilluminated reticles
www.leupold.com/pi_illum_scopes.htmltheres also some nice ones @
www.bushmaster.com/shopping/scopes/good luck.