I am ordering a new FX in the next few weeks. I have a Dream lite and love it so am for sure buying another FX rifle. I want more power so considering the Crown and M4 rifles. I understand all of the advantages of the adjustment capability of the M4 and overall high ratings. I like the design of both guns equally. One concern is a posting I read here on the site that the M4 has more O rings than the Crown and (at least the poster) was of the opinion the M4 was not as reliable in the long term as the Crown would be. I shoot more than the average person so trouble free longevity is important to me. I am interested it your opinions regarding this issue.