What barrels are easier/quicker to get? Ive called several "builders" and it sounds like it takes about 3-4 months just for the barrel to get in. Rem700 in 300RUM
Depending on what you are looking for several places that stock blanks: Bruno's, Third Generation, Bugholes, Grizzly, Midway, Brownells, and Krieger has an inventory list on their website.