M417 Problem

[dimitric12h16n2]

I've owned two m417's and both of them have an issue with the bolt that when I fire, the bolt slides back about an 1/32 of an inch from where it clicks shut, I have to use my index finger to keep it from inching back that little bit, is this normal ? I use pellgun oil on my pump cup after every tin i shoot through. any solution, I cant take it back now

[aznboi3644]

same thing happens on my 760.  There is no o-ring to seal the breech.  Just metal to plastic fitting.

Lost power is just part of the design