AR Question/Help

[sdmc530]

I have a DPMS flat top AR15. I like shooting it, I know I am a pistol guy the AR is a ton of fun. anyways I purchased a red dot you can follow the link here to see what I got...

http://www.midwayusa.com/product/551...tte?cm_vc=S014

Anyways I was wondering if its smart/dumb to still put on a front sight on the gas block? I know its redundint but it just makes sense to me. Is this a bad idea or is a common practice with AR's?

Thanks!!!