Have a M&P and I have no problems so far. Had it about a year. Shoots any .22 LR but the Winchester bulk leave a lot of residue. I just stay away from them. Think about buying another one and do some mods. Add a Fast Fire II sight and have a trigger job done on it. I bought a picatinny rail sight mount that attaches to the bottom rail. I guess that's about all you can do to one except just shoot it. The mod. one is going to be strictly a range gun. The first one is a great one to have in the woods or fishing.