I just had JP Enterprises make me a 204 Ruger upper. I think they also sell just the barrels. Lilja web site says they have 204 ruger barrels in stock. I have been told the JP is a very accurate barrel but when I was measuring the chamber it looks like they use a SAAMI spec reamer. Not the best for loading bullets to fit magazine length and the barrel twist they offer is ideal for 40gr bullets but if I loaded the rounds even close to the lands the shorter 40gr bullet would not even seat in the case. I will see how it shoots but if it don't shoot like I want then I will have a custom reamer made that will work better for 40gr bullets loaded for magazine length.