I've been thinking about building an AR, and i would like to cast for it if im gonna build it. From the research I've been able to do here, a slow twist barrel is a necessity, otherwise the barrel will lead horribly. The slowest twist I have been able to find on midwayusa is a 1 in 10" made by olympic, and it is quite spendy. Anyone know of a good source to pick up a barrel for an AR that is closer to the 1 in 12 to 1 in 14 twist I believe I should be looking for? Any input much appreciated. Oh, and to clarify, this is for .223