Someone explain this for me ?A formal review containing in correct information such as thisToday is velocity day and a chance to become better acquainted with the test rifle. If you just found this blog, read Part 1 linked above. A short introduction is that Nitro Piston is the Crosman-trademarked name for a gas spring. Performance of a gas spring is a bit different than for a conventional coiled steel mainspring, though in the end both are spring-piston airguns. A gas spring uses compressed gas instead of a coiled steel spring to push the piston that compresses the air for each shotIs to be allowed publishing?This type of thing is what clouds and confuses peoples understanding,no such thing as a gas spring air gun.