I'm starting to plan my AR build and I don't know what I should choose or what all of the choices are. Pros/Cons suggestions ? I have not purchased any parts yet.
Want more options? Then get more uppers (or complete rifles for that matter). I agree with everyone else 5.56 first. Personally my "pet" upper is a 6.5 Grendel I have had my eye one. Or maybe a 6.8SPC. Oh bother......Your first should always be a .223/5.56 for the reasons mentioned above... Now, the second and third...
Without a doubt...get a 5.56 for your first build.
After that, I'd look at a 308 if you want to move up, or a 6.5 Grendel that you can just get an upper/ammo/mags and use your AR-15 lower.
PM me when you do. Which 10 do you have?Others suggest 5.56, but I would suggest 7.62 NATO. Yes I own an AR-10 and love it, but I would NOT recommend Armalite simply because of the magazine prices. I just ordered ten 20 round mags @ nearly $560. DPMS upper with a CMMG G3 lower would be the best combo as G3 mags can be had for $5 each. Had CMMG had this lower when I was buying a rifle, I would have gone that direction. I still may go that way and sell my Armalite and mags.