So I was shooting some groups with the Bantam Sniper and was getting erratic groups, I know what this gun is capable of and something was definitely wrong. First thing I did was clean the bore, this did not correct the problem, next thing I did was shoot over the Chrony and this revealed a problem right away, my velocity was all over the place, from 920 FPS to 885 and everything in between. I am accustomed to being within 3-4 FPS consistently, next thing I did was check the probe O ring and no air seemed to be leaking by. Next thing was transfer port seal, gun was too new for this so before tearing down I moved on to the next possible cause. I removed action from stock, removed hammer tension screw and spring, removed the hammer and it was contaminated with lube. The number one rule with any mechanical PCP is never ever lube the hammer weight. This was kind of my fault for lubing bolt too much and after shooting a couple of tins of pellets the lube migrated down into the hammer weight. I cleaned up everything with isopropyl alcohol inside and out, cleaned up any excess lube from bolt shaft, Reassembled everything else, Shot over chrony again and velocity consistency has returned to normal as well as accuracy.
