Give it a good cleaning and lubrication and it should shoot well for you. I'd order some extra recoil buffers. You should have two in the box, but it never hurts to have more. I ordered an extra recoil springs and rods based on the theory that if I'm careless they can be launched into the nether regions of the workbench only to be found by archaeologists in a few millennia hence.
I've gotten the best results with mine using standard velocity ammunition.