I'm currently torn between a 16" mid-length gas, 18" rifle gas, and 20" rifle gas barrel. Back in January, I ordered a WOA service rifle upper (A4 flattop, 20" 1:8 twist stainless, free flat "standard" hand guards). I was originally quoted at 8 weeks, and I've been calling since the 6th week, but I'm sick of being told "yep, it'll ship in 2 weeks." I understand how custom things work, this isn't the first custom part I've ordered, but the more I wait the more I'm changing my mind about the choice. I already built my lower back in January for it, it's an A2 stock with a Geissele SSA-E trigger. My original thought was to have a rifle in a likeness of the one I'm given at work so I can train with it, but now I'm thinking about a 16" or 18" with a 13" free float hand guard. For an idea of what I like, I've always loved the MK12 Mod 0/1, but also appreciate the "stock look" of an M16A4. I shoot both offhand and with bipods, irons and scopes. I currently own a 16", carbine AR15 which my girlfriend has taken over and I haven't gotten the chance to shoot it in the past two year; I'm not complaining, but it's also not that accurate. I also own a 16" AR10, which is very accurate. I also own a ton of other firearms, semis\bolts Regardless of choice, I'm looking for sub-MOA, 1:8 twist. I bought a few thousand projectiles for testing, ranging from 55gr (my normal load) to 80gr. The range I shoot at regularly goes to 200yds, which is nothing, but occasionally I hit a range that's 600+. I understand either choice would be able to do this easily.
To clear up the question, would you continue to wait for the WOA upper which could take who knows how long, or build a 16/18" upper that I could have done next week. For 16" barrel, I'm looking at a "Ballistic Advantage .223 Wylde Govt. Tactical 416R Stainless," and for 18" I'm looking at a "Green Mountain M24 .223 Wylde 416R Stainless." Again, both are 1:8 twist and I do want stainless, but no, I'm not interested in spending $400 on a Rainier Ultramatch barrel.