I did it a few years back, had to make a special spring compressor to reassemble but not too bad. Right now I have a Remington M14 rifle downstairs on the bench in parts. I got an ultrasonic cleaner that needed a test run and this was a likely candidate.I highly recommend them, they can be bought used on eBay for less than $200. They are non toxic, and the parts come out amazingly clean, the amount of nitre blue and case color on the small parts is extraordinary. Plus, with something like a Nitro Special receiver, the entire unit can be put in and cleaned, boiled in hot water, blown out and then soaked in displacing oil or ATF, with out removing any small parts.
The M14 however in another story, this one may have to go out for reassembly.
Here are some pages to help with the NS.
