Nitro pump airguns are they any good?

[Multigunner]

As a matter of opinion only. Most of those nitro gas rams are essentially developed from the gas rams used to help lift and hold car rear hatch's.

How often did they sit under pressure before being used? Temp extremes from -40 to over 120 F.

How many did you see fail before the car was say 8-10 years old?

Actually I've seen quite a few of those hatchback cylinders fail in far less than 8-10 years.
Those pistons also get very little cycling compared to those used in an air rifle. You aren't likely to open and close a hatchback fifty times a day. Those I've replaced failed completely, complete loss of gas , and both sides were kaput when the owner got around to replacing them.

[Boolseye]

My Crosman Vantage NP .22 shoots great after maybe 800-1000 shots.
Bare-bones gun but very well-built and hard hitting, it makes about 19 fpe on average with 14.3 hps. I’m sold on the nitro piston design. Mine is smoother in every way than my spring guns.




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[TCLouis]

Apparently from what I read, the steel springs break too so it might be interesting to compare MTBFs for both as well as failure rates.

[glockfan]

all i know is my benjamin 1200 fps nitro rifle has swallowed thousands of pellets without an hiccup and i've put down countless squirels and different critters with it in the past 3 years . just keeping the pressure seal and hinges lubed and it will last for years no problems.