Do you different points of impact with dual cylindered Model 650?
I would always recommend adj sights on convertible guns, therefore advise putting the extra cyl in the 651. Especially since there optional cartridges for the mag cyl and so many choices in 22 LR.
Lately I've been shooting 22 WRF in my small frame 22 magnums. They're cheaper, just as accurate as Subsonic Mags, and as nosho posted, "low blast/recoil/flash".
I also shoot sunsonics in the LR cyl which can benefit from an adjustable sight.
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Jim
S&WCA #819
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