or the lack thereof....

Recent purchase was a S&W Model 36, no dash, 3" barrel. Almost no wear, probably less than a box of ammunition through it since it was new in 1976.

We have tried multiple brands of ammunition, and can't get anything to group less than 4-5" at 7 yards.

I'm sure that it's not operator error. I shoot well with every other handgun that we own, including several revolvers from the same time period, semi-autos, and a couple of modern short barrel revolvers.

Any thoughts on repairs, modifications, or adjustments that might help? I really like the gun, but don't want to hang onto one that isn't accurate. I bought it at a good price, so recouping my investment would not be a problem.