I own mostly Airforce brand pcp..That being said they choose to use german barrels..They will need to use A USA made barrel like ER Shaw or Green Mountain barrels to name a few.. I used to work at ER Shaw barrels in Pittsburgh Pa. The steel used for the barrels comes from the steel mills in pittsburgh pa..My lother walther .510 barrel was super rough,,the ER Shaw,Green Mountain Barrels, make the same or better quality.. For us with PCP, our air source for under a $1000.dollars is all chinese.. A american made compressor or booster even used are $3500.00..ahhh I can,t afford a compressor that cost more than my car..