The rail comes with a two piece barrel and has some slight changes, such as a new Feedneck, ASA (On/Off), Different Bolt, Ultralight Frame, and an aluminum body. The SLG has a bit older parts, and has a type of plastic for the body. This makes the pricing about 200 different between the two.
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There isn't a Proto Slg 2010
Unless your thinking of a Pmr Which is a all round higher quality marker