I purchased LPA adjustable rear sights for my 6906 and 4566 pistols which have dead night sights.
I have a heavy duty professional, fully adjustable sight pusher tool. The 6906 back sight took a LOT of pressure, then popped free.
The 4566 sight is so tight that the sight pusher is bending and there has been no movement of the sight!

I've soaked it in Kroil and completely removed the set screw.

Is it safe to apply some heat to the sight?

I think the problem is the red thread locking compound S&W applies, as there was some of that stuff in the dovetail of my 6906.

Are you pushing the sight from left to right?
From my previous work on two third gen guns, I seem to recall that the sight can only be pressed in from right to left, and pressed out from left to right. The sight channel is not uniformly wide and gets too narrow to press all the way out from right to left.

Assuming that you are pushing in the correct direction, it might be the Loctite. I don't recall seeing any kind of Loctite in the sight channels of the two guns that I did. But if yours has Loctite, I believe that the Loctite company markets a chemical that can remove Loctite. You might want to call them to ask them what to do.

Safe yes, wise no. It would be better to heat the slide with something like a hair dryer. You don't want to heat expand a sight that is already too tight.

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NRA Benefactor

Get one of these. I bought one from a forum member and it worked great. I had a VERY stiff rear sight on a SW1911SC and Commander and on the Commander, you could actually hear a pop when it finally broke loose. The SW1911SC was a bit easier. No heat required. I used the brass screw he provided and didn't have to use the steel one.

http://smith-wessonforum.com/accesso...sher-tool.html

I just found them on ebay, and ordered one...awesome tool I am glad you posted this ColColt...

The 6906 sight pushed out from right to left as observed from the rear of the pistol, which is how the LPA instructions illustrate removal. The new sight went in from left to right. I don't see why the 4566 would be any different.

My sight tool is very similar to the tool posted, so guess I'll take it to the local gunsmith and let him have the fun.

Too bad as I've used the tool on a 3913, 6906, CZ-75, ATI Firestorm, Kahr CW-45 and Beretta 92FS without incident.

Your dovetail on the 6906 may have been damaged. Andy05 is correct, your 4566 sights come out left to right.

S&W factory almost always installs everything, with the barrel pointed away from you perpendicular to the ground, from right to left. To remove, from left to right. This includes sights, pins,etc.

This may make the picture clearer. Again, with the barrel pointed away from you and perpendicular to the ground, on a S&W revolver, when you remove the hammer, trigger, cyl stop, etc., they are removed from left to right. When they are installed, from right to left.

Now I know probably no one removes and installs revolver parts without the revolver laying down, sideplate up, but the above paragraph is kind of an over simplification just to make a clearer picture.

Hope this helps
chris

Is there an adjustable rear SS sight for the 4566? I was shooting a 1006 alongside the 4566 and it had fully adjustable rear sights. Both pistols were very similar when placed together. S&W doesn't have adjustable sights listed for the 4566 but if the dovetail is the same..............????
Brownells has nothing. Thor

I have not seen a 4566 adjustable factory style. I have seen them on a 4506, which is like a 1066. I have an MMC brand adjustable rear sight that I took off my 4566, but it fits the fixed sight dovetail and doesn't look like S&W factory adjustables.

Yep, the 3rd gen, SW1911 and M&P sights are removed left-to-right and installed right-to-left (the slide stop lever is on the left side, and the extractor is on the right side).

When I was first using the original (discontinued) factory-purchased sight pusher, we were told that sometimes the screw handle might have to be tightened as firmly as possible, to "load" the screw/pusher, and then the end of the steel screw/pusher (at the cross handle) might have to be smartly struck by a ball peen hammer in order to break the rear sight base loose. (That model of pusher had a rather large & robust screw/pusher, though.)

As time passed I encountered some S&W pistols that required that trick in order to get the sight bases moving. (Naturally, that was something the instructor recommended with that particular sight pusher, and that method might well damage other types. The large steel "head" on my pusher certainly exhibits some peening from hammer impacts. )

Before I finally broke down and ordered a sight pusher I did it the old fashioned way taught in the classes, and used a brass drift punch and a ball peen hammer. Fortunately, while some guns required some significant whacking in order to get the sight bases moving (and I had to re-shape any number of brass drifts from time to time), I somehow managed to have never damaged a set of night sights. Talk about luck.

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Ret LE Firearms inst & armorer