I have only had my Bam 50 for 2 weeks or so, I have noticed everthime I pull the trigger the bolt would turn anticlock wise by about 5 degrees. Is it normal? Also, the thing is less accurate is than expected (8mm CTC with most pellets from 10 m), worst than my R800 CO2 rifle. IS something wrong with my gun? I don't really have much experience in it and the internal stuff is hasn't been touchede at all.