I just sold the junk nikon scope on my ar and now am ready to buy a new one. My ar is a 20in barrel and used for coyote hunting and target shooting out to 600. I like the vortex viper hs lr 4-16x44 but i am worried at 13.7 inches long it will be a little long and bulky. I also like the pst 2.5-10x44 and at 12in it should be a great size but is as far as my budget will stretch. I also prefer to have more than 10 power. I am not dead set on vortex but it must be 30mm tube, open turrets and 600 is as much as i can spend. Any suggestions would be great.