The purpose of the firearm will be for target shooting from 100-400 yards. This is more of a cheaper build, as upgrading or acquiring a more precise AR would cost me 2-3 times the cash.



Scope:

Simmons Master Series ProSport Rifle Scope 4-12x 40mm

Base:
Right now, I was considering this 2-piece mount by Burris -

http://www.midwayusa.com/viewProduct...tnumber=665735

However, I have heard some people mentioning this EGW base.
http://www.midwayusa.com/viewproduct...tnumber=113796

#1 - will it fit?
#2 - Will it affect loading/case ejection?

Rings:
I need some help on the rings. I called Simmons' tech-support line, and they recommended medium-height rings. "Medium tends to be a good catch-all." Agree or disagree? Thank you.