I have a brand new 5 inch barrel from Macon armory with a 3 lug adapter from silencer store he added to it and machined the barrel to fit into the adapter as far as possible. I paid 160 for the barrel and 50 for the adapter. The only problem with it is the finish is is messed up where the barrel necks up for the chamber due to a defective spikes barrel nut that didn't fit, you won't be able to see it when your barrel nut it on. I'll send picture if anyone wants one. I'm only selling because I ended up with a different barrel by chance. So all together I've got 210 in it. I'll take 170 and I'll pay the shipping.