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If it is a 4" or longer barrel model, most likely it is a square butt (98 or 99% chance). If it is a 3" or 2.5" barrel model, it is almost certainly a round butt model.

If you have any doubt, remove the grips and examine the back strap of the grip. If it curves inward at the base, making a smooth outline, it is a round butt.

If you have any questions, contact me and I'd be happy to answer. I love this revolver.

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16y ago
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Q: Smith Wesson Model 66-4 Square or Round butt?
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