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Personally, I'd love to have a 551. Seems to be one of the earliest gas-pistol rifles in .223. Apperently they can be converted to the shorter Sig-Sauer model 552 commercially for around $2,500, but I'm sure it would be cheaper to do it yourself.
Link...
http://www.biggerhammer.net/sigamt/550/550techinspection/
Great photos...
Link...
http://www.biggerhammer.net/sigamt/550/550techinspection/
Great photos...