It is a Monson Blued Steel Model 44 with an 8" Palmer compensated barrel.    It looks Hard Chromed?

For Rear sights, look to Ruger.   Some say any of the Ruger revolver sights will work, but Ruger tells me that the GP100, Redhawk, and Blackhawk all have different sights.

For the Barrel Removal tool, EWK.

For the shroud end cap, maybe DW, but likely SOL?

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