I don't know if the following comments are relevant to this thread, but I'll make them anyway. I didn't see a reference to the type of ammunition that Sgt 45 is using. It's my understanding that the model 69 is a .44 magnum. However, less than full strength loads or .44 specials can also be used. I make this comment because it coincides with a question I asked on this forum, which is, why are rear sight blades for 19's and 66's so much taller than for 15's and 67's, They are basically the same revolvers but for 15's and 67's being limited to .38 Special rounds. (Although I'd wager more .38 Specials are shot out of 19's and 66's than .357 magnums, by far.)
Somewhere I found this listing of sight blades and corresponding handguns. I think, but don't know, it is from S&W:
Unfortunately, it does not include the Model 69.
My question was why do model 15's and 67's have sight blades of .106, but 19's and 66's have sight blades of .146? The answer was that the faster bullets hit lower. Slower bullets give recoil more time to elevate the barrel and therefore they strike higher.
At any rate, last I checked .108 height blades and others are available and may be the least expensive solution.
