The Ruger is in general rubbish and has been outsold by the Marlin semi action worldwide by somewhere between 1:2 and 1:3 times. The Ruger magazine is a good design but not the best when teamed up with a semi auto as it is renowned for clogging up with blow back gases. To get Rugers shooting OK will cost you a lot more than $100 with todays gunsmithing rates.
If you want a nice semi look out for a Marlin 60 DLX. @sneeze has a very nice example and they do not cost the earth.
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