Gentlemen, Thank you all very much for your feedback. It was old oil and powder residue binding the locking bolt pin. I blasted it out with WD40 and cleaned/lubed it - locks up tight now.
Gents,
Have a beautiful Model 19 that I got from my father on his passing. Took it to the range and after one cylinder of .38spec FMJ factory I noticed that the cylinder was difficult to close after opening. It seems the Locking Bolt Pin doesn't want to depress easily and thus catches the...