I bought a 300win mag petra that came with a stainless steel 22 inch barrel. It shot sub moa. I came across a deal on a new 20 inch proof carbon barrel made by proof for a falkor and I installed it. It took almost 2 pounds off the weight of the petra and it shoots even better. Sub moa groups with factory hornady, s&b, and federal. The fit and finish is excellent on the falkor rifles I've handled. The upper/lower are the tightest fitting receivers I've seen. The gas adjustment on my rifle is on the bolt carrier which is not as convenient as an adjustable gas block. Mine came with a +2 inch gas length. I've got over 400 rounds thru it with no issues so far. I've got the metal feed lip magazines. What caliber are you considering?