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Steven, I missed the part of your question where you were asking about rifling, target crown, spiral finish, matte black finish, target trigger, laminate stock, no sights, scope base adapter, rotary magazine, overall length, unloaded weight. Silly me, I thought you were asking about the barrel length. The lesson I learned, go off on a tangent and get chosen best answer.
The Ruger 1121 10/22-T 10/22 Target Rifle in .22 LR features a 20-inch heavy barrel with 1-16 inch rifling, target crown, spiral finish, matte black finish, target trigger, brown laminate stock, no sights, scope base adapter, detachable rotary magazine, an overall length of 38.5 inches, and an unloaded weight of 7.5 lbs.- copied from Google. Hope this helps.