A quick reminder that french special forces had this...
Even the MR 73 itself is insane since while every special forces were emerging (GSG9 in germany after Munich terrorist attack at olympic games) and each one chose semi auto handgun. But France chose a revolver (mostly because of a superior reliability and accuracy (and cartridge power). And this has been use during some critical situations like for example the Air France 8969 (Paris - Algiers flight hostage taking), and proven effective. But a dude was like : "Hey! what if it was a sniper". And this model has been use on field too, the most famou was the court hostage taking by Georges Courtois in 1985, INA archive shows brievly a GIGN sharpshooter with it.