ok , i was at the gun shop about a month ago when i was buying my new m4 and as i was leaving the guy at the counter was telling me all about the rem. 6.8 and now it's all i can think about . I know the ammo is more expensive but i can't help myself i want one so bad . I'm currently thinking about just getting a 6.8 upper and some mags if thats poss. however i really want to build an ar also so maybe i should just build a 6.8 ....or should i go with a different caliber ? so fellas what do you think . and btw for me to build a gun over time just will not happen ,  once i get started it has to be finished ..like as soon as i can get the parts to my house . i have zero patients  "i think this is a man thing "

Have one 6.8 from Cardinal (20") and another due to arrive soon from Titan Armory (16").  Ammo is about $1 a round, but I like the beefed up AR platform.

C-Products sellls mags.  SSA and Horandy sell ammo (and some others).

Buy 7.62X39 upper cheap ammo, bigger bullet, holow points

I'll take a 6.8 over 7.62x39 any day. I have two. A 20" and a 16". Ammo is more expensive but learn to reload them and there is a very good selection of bullets that can cover varmints to deer and even elk have been taken with the 6.8. The bolts are generally stronger in the 6.8 despite higher operating pressures over the 7.62x39 as there is more meat left in the bolt.

What you really want is a .458 SOCOM.  6.8mm just doesn't have enough punch.  And you have to get those proprietary magazines.  .458 SOCOM uses unmodified AR mags.

Get one of each.  I am - when I have the $

Check out http://www.68forums.com/

I have the Bushmaster 6.8 and love it.  I can't talk you down because I have the bug too.  I just added 5.45x39 to the mix and I'm giving 6.5 Grendel the eye now.  I just can't get enough. I love the AR platform