I've put two lowers together, and got the pre-built uppers (no tools for that in a condo). Jlloyd is correct about the triggers. The 1st one I got was harsh to say the least. There's a quick fix for that, and I can send you a link if ya'd like. All that needs to be done is modify two springs. If ya screw it up, yer out a buck plus postage.
The difference is night and day.
For the 2nd, I opted for the RRA Match trigger. All I can say is WoW!
If yer gonna scope it, settle for nothing less than the Burris P.E.P.R mount. PM JLA for a 2nd opinion.
No offense snakedriver, but I have a letter from Del-Ton that states in no uncertain terms the the use of steel cased ammo WILL void the warranty. Unless that has changed in the last three years.
Good company, good product, outstanding value.