All of these are known to be excellent.
http://www.riflebarrels.com/products/ar_10.htm
http://www.rainierarms.com/?page=shop/detail&product_id=2239
http://www.lothar-walther.com/473.php
http://www.bartleinbarrels.com/index.htm
http://www.jprifles.com/1.4.1_barrel.php
http://www.kriegerbarrels.com/AR_10DPMS_LR-c1246-wp3393.htm#AR-10/DPMS-LR
http://saternmachining.com/custom_barrel_prices
http://www.gaprecision.net/
http://www.fulton-armory.com/barrelfatitan20nmhbarss1x12936gasblock.aspx
http://criterionbarrels.com/ProductPages/AR10.html
I have a few but they're not in very good to excellent condition so I don't advertise them. They are functional. I also have some with minor flaws (needs sewing, etc...) that I sell very cheap, below my cost :-( PM me if interested.
That made me think of my buddy that lost a monster buck 20+ years ago. He was using a Remington 7400, when he got in his deer stand he eased his bolt home & loaded the mag . A few minutes later Bullwinkle appears & CLICK <lmao>
Out of the ones you have listed I'd defiantly go with the Vortex Viper. Here's another one that comes to mind http://www.brownells.com/optics-mounting/scopes/rifle-scopes/m-308-4-16x42-riflescopes-prod55012.aspx?avs|Manufacturer_1=NIKON or http://swfa.com/Nikon-M-308-Riflescopes-C4157.aspx it's more $$ but it comes with the 1 piece scope mount. The Vortex warranty is outstanding!
Welcome to poverty! :))
Well if you're shooting sub .75" groups the trigger isn't too bad? If you haven't already done so I recommend that you watch this video
They'll be gone shortly.http://palmettostatearmory.com/index.php/ammunition/rifle-ammunition/federal-gold-medal-match-308-168gr-sierra-matchking-bthp-20rd.html