I have been using Nitrogen for going on 5 years now Starting with a GX CS2 that I fed at 5-8 psi , I now mainly use a flowgauge at 25cfh/13lpm I still use the gx cs2 with a 20cuft nitrogen bottle for use in the truck.
The inside inlet filter (blue and white) is removed and replace with a Western Enterprise AW-15A 1/4 inch NPT male to 9/16 rh inert female then just use the hose and fittings from your mig /tig hose to regulator and the adaptor aw15a. then I twisted one of the slats for air in the back to fit...
In .177 I have had good luck with the winchester round nose and the Tomahawk's both 7.6gr the pro magnum .177 shot crappy in everthing I tried these are all made by Gamo
Just get an idustrial Nitrogen regulator rated for 4500 psi from the local welding supply co Harris , Victor ,Smith and many more probably in the 3-4 hundred$ range but shop around find out who repairs reg's in your area might find deal on used
Thats the one I have it's been going for almost 2 years no auto anything and I only feed my compressors Nitrogen . Do Not use Royal Purple I use chemlube 751 also hear good things about Rarius?? (spelling)
Just to let everyone know I got my Notos Lever from Saneroner and installed it on my Notos and it works great. The guy was a pleasure to deal with. He shipped well packed and his price was fair, don't hesitate if you would like to get one from him.