Hey Vince! If I did get grease into the hop up, I have since put probably, maybe 1500ish rounds thru it before I rechecked it on the chrono, and am thinking that any grease would have gotten worked thru the gun by now? Maybe??? I'll run a rod and patch thru it...I thought I made sure to double check everything, even used brand new hop kits and bucking and checked the bucking with a light to make sure it was seated...I did use a "little" grease on the hop sleeve to facilitate sliding the bore and sleeve back into the hop, cleaned off the excess...I can take it back apart tommorrow and recheck everything, I thought it seemed like too much of a loss of fps. Thanks! I'll post my findings...