My owner's manual does tell how to field strip, but after doing it once and having to call Browning to get needed springs and clips, I don't do it any more. I pull some patches through and lube. I would not hesitate to buy the Browning.
I have never owned a Ruger Mark .22 but have heard that the reassembly on them is more difficult than the Browning. But they are well respected pistols also.