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The Aagil Arms Complete AR-15 .223 Wylde Upper Assembly features a 20" barrel with a 1:8 twist and HBAR profile.
The one I bought from Aagil Arms Site, is a 20" Chrome Molly Valium barrel (not stainless steel) with 1:8 twist. with straight fluted barrel, No BCG. Just what I was looking for. I see lots of people trashing these uppers, but I have bought several of there uppers in 5.56, and .223 Wylde, and I added a Toolcraft BCG for $84 at PSA, and they run like a sewing machine. They do make a stainless steel one with 1:7 twist, but I don't know which one this is, maybe the stainless steel nitrite treated with 1:7 twist like it is posted here. But I wanted the CMV nitrite treated one they sell on their site, that's the one I bought. I like it.
I bought mind from the Aagil Arm Site, it was a 20" chrome molly valium nitrite treated barrel straight flutes, with 1:8 twist, Rifle length gas. I did not buy their BCG, I put a Toolcraft BCG I got for $84 from PSA, and it runs like a sewing machine. I am using a carbine buffered lower, with a rifle length gas system. Works great for me.