After trying to get my first .177 to work for about three weeks, I finally gave up and sent it back to Crosman. My main problem was inconsistancy in grouping and the damned thing would develope a problem, then it would just disappear.
I could shoot a 3/4" inch group of 6-10 shots at 25 yards, and then it would shift 1" to the right, 2" high, for two to three shots, and then back to my original group. While shooting in a regional FT event a couple of weeks ago, it was acting like it ran out of air after about 15 shots, the meter still read about 2200. I recharged, and everything was Ok.
Crosman was very gracious (but slow) in replacing it. My first one said 22cal on the breech but was realy a .177 also.
Well the new one is exactly what I expected. Although I have only ran about 150 shots through it, it is 100% consistant.
The new gun is quiter, smoother, and can rival many of the Euro guns at half the price.
Somethings I have learned from my experience. The barrel flexes a lot more than I thought, my new band probably has 3 times the clearance as the old one. You will have to use high rings for clearance with the larger objectives. Removal of the lawyer spring is fantastic. You will have to raise the cheek riser ( I talked to Graco today and they are going to fabricate an adjuster for me, extra high of course, really really nice people). You are going to need an adjustable but pad ( cheap and easy to install). It shoots JSB Exact heavy very well. It is hard to clean the barrel. Crosman definetly has some QC issues, but is working very hard to correct them.
If you are having problems just return the damned thing and save yourself a lot of frustrations.
Bob