I bought a .308 1/10 5R Heavy .920" Steel Prefit barrel from them over a year ago, and installed it on a Remington action, in a MDT XRS Chassis. I have shot about 250 rounds through it doing load development for 168gr, 175gr and 185gr bullets. It consistently shoots sub-MOA at 300 meters, with the loads that produce the low SD & ES numbers shooting under 1". The fit was flawless, and their muzzle brake fit perfectly. I will be changing the barrel on my .223 Weatherby soon and I will be getting another barrel from IBI.