Already own 3 AR's. So with that out of the way I would like to move on to the next one. XCR,SCAR,or any other type pistion AR. Been reading all the info on all weapons and it comes down to price and avaiableity. So with the many piston AR's already out there and there are a bunch. I need the pros and cons of each. Scar is out of my price range for now. ACR who knows when and if. XCR is affordable right now. POf and others are now but pricey. ???