FAC Rapid power curve

[L-S-R]

i fill my .22 MK2 Rapid to 180 bar and it has to be topped up again at 120 bar. I get 36 consistent shots before the power drops off. This should not be the case? it the efficiency of my gun up the left or what, it is running at around 800 fps with Bis Mags.
19" barrel. (POI is fine for the first 3 mags then it drops about 2.5" at my 50 yard zero). Anyone suggest hat the problem is and is there a cure for such a high power curve?

[bengarzy]

I do a regulator conversion for the MK1and with the 19" barrel can give 60+ shots at solid 30 ft lbs
look atwww. bentaylorandson.co.uk

Ben

[Baldie]

This link will work...