I see Primary Arms hasn't been mentioned. Seriously, if the scope's just for fun give them consideration. For budget optics they are reviewed quite well. As others have mentioned there are threads about them on AR15.Com - Your Firearm Resource. (AR-15, AR-10, M4 Carbine, M16, H&K, SIG, FNH, FAL, AK-47, 50 Cal, M1/M1A, Handgun, Pistol, Training, Hunting, and More!) . I personally have a Compact 3X on my AR and have been very pleased with it. They are really good value for the money.