The SP101 is a fairly heavy small gun. It will carry differently than a J-frame or Colt DS. Spare ammo on the off-side will help balance. Tie downs may be advisable too. Shoulder holsters are kind of like coats, different ones will fit different people differently. Personally I like the Miami Classic, but that's just me. Other good ones out there. I am not sure I would go with the upside-down holster for a weapon that heavy, but again maybe that's just me.
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