Is the air leaking around a fill probe or does it just not go into the gun? My SPA fill probes leak sometimes but a little silicone grease on the O-rings of the fill probe normally fix that. (The Caiman probe is noticably better made and has not been an issue at all so far) If the gun just won't take air it may be the O-ring that acts as a one way valve. I am assuming that is what your gun may have. On my P35s this O-ring has to be replaced on several guns but that is super easy once the gun is degassed and the big nut is off the end of the airtube. Regardless on how your gun does the one way valve for filling it is likely the issue if it won't take air.
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