I am thinking about shooting my 645 in IDPA Custom Defensive Pistol which has a weight limit of 41oz including an empty magazine. Will it make weight? I hope so, I don't have a new gun in the budget and it is accurate and about as foolproof as a baseball bat. Thanks for any help, Jim.

The only weight I could find for a 645 listed it at 37.4 ounces. I do NOT know if that is with an empty mag or not. I would assume it is, but I am not sure.

1.06 kilograms empty. (35.3 oz/kg) Pretty sure it makes weight with a magazine. Unless you are shooting a major match, most clubs dont weigh your gun.

That's the same weight I have found too.