This is my 511-X Scoremaster we all call the Squirrelmaster. I use the flush-fit six-round magazine, because the 10-round mag keeps poking my back. I originally had a Weaver wide-angle 4x on it, but when my wife bought me the new Leupold VX-2 3x9 for my mountain rifle, I put my 4x Leupold on the 511-X. I removed the open sights, as I tore a couple of nice soft cases with them. From tree squirrels in Michigan and Missouri, to gophers in South Dakota, to prairie dogs in Colorado, the rifle has never let me down. I bought it used in 1972 in exchange for chopping corn out of bean fields. The farmer and I both swear we got the best of that deal.