Hello everyone, I'm completely new, not only to this forum, but to this world of building AR's as well. With that being said, I have done a bit of reading through the forums and I've put together something of a first draft of a DPMS pattern .308AR. I don't even know if this will work or is complete, hence why I'm coming here. I want to make sure. I also want to get a second opinion as far as whether or not I could save money (without sacrificing quality) or if a component I have listed is a low quality component that could do with being replaced by something better. Here it is: -Lower- Aero Precision 308 AR M5 (stripped) http://www.brownells.com/rifle-parts/receiver-parts/receivers/lower-receivers/308-ar-m5-lower-receiver-prod71464.aspx -Upper- Aero Precision 308 AR M5 (Assembled) http://www.brownells.com/rifle-parts/receiver-parts/receivers/upper-receivers/308-ar-m5-upper-receiver-prod71789.aspx -LPK- (No trigger group) http://www.fulton-armory.com/lowerreceiverpartskittitanwithouttriggerparts-1.aspx -Trigger- Geissele High Speed DMR https://geissele.com/hi-speed-national-match-designated-marksman-rifle-dmr-trigger.html -Barrel- Faxon 20" (WITH gas tube and low profile gas block) http://faxonfirearms.com/20-heavy-fluted-308-win-rifle-length-416-r-stainless-steel-qpq/# -BCG- Aero Precision w/ forward assist, complete, NiB http://aeroprecisionusa.com/308-bcg-nib.html -Stock- MagPul UBR Collapsible https://www.magpul.com/products/ubr-collapsible-stock -Charging Handle- TacOps Sniper model for .308 http://mechdefense.com/products/ar10-charging-handle-tacops-sniper-for-308 -Rail System- Fortis Switch 15" Free Float http://www.primaryarms.com/switch-15/p/switch-15/ -Sights- Diamondhead http://www.at3tactical.com/products/diamondhead-diamond-sight-front-and-gen-2-rear-1199 Now I know I need a receiver extension/buffer/action spring for the stock, and a quick suggestion for where to find that would be appreciated. :) Is there anything else that I'm missing, or something that won't work? I do know that this will be a heavy son of a gun and I'm okay with that (I think) for now. With that being said though, I'm always open to more suggestions. You guys are the experts, I'm just the new guy. ;)