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Air arms Galahad problems

i bought a Galahad .25 cal Fac (United States) in 2016, ten months later it started leaking when I sent it back, air Venturi fixed the rifle, and said in the work order they replaced a plunger regulator o ring.
i cannot find that part in the oarts drawing in my owners handbook. 
So this weekend , 10 months later it is leaking again. I can hear the air escaping from the muzzle, and from the breech when it is open. 
It this a problem natural to Galahad’s? Are they leakers by nature?
eill I be sending this rifle back every time I shoot it 500 times?
any feedback would be really appreciated.