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I have also ordered and it’s been great. In stock stuff comes quick, pre-order stuff on or before quoted time.

I've ordered several things from him, all of them arrived quickly.

Be careful with the front, the mepro front post is made of very soft metal and the threads will strip very easily.

5.5mm wrench for the front. It can be a pain in the ass to get the nut started. For the rear it is pretty easy. Just observe where the spring goes as you disassemble it.

The factory stakes those two screws which tends to cause the tip to break off when unscrewing them. Sometimes they’re salvageable. My guess is they have a arbor press of sorts with a fixture that holds the receiver. It then reforms the screws to act as method of keeping the screws from backing out on their own. When I have reinstalled the iron sights with new screws, they can removed without damage. You’ll want to use some kind of thread locker like blue Loctite. If you’re going to leave the rear off, put the screws back into the housing along with the lock washers to keep from losing them.

The screw heads are located on the inside of the receiver. Remove the trigger assembly and you'll see them. Be aware that when I removed the rear sight on my first M4 back in 2016 the screws appeared to be somewhat swaged. If that's still the case you'll likely need new screws if you want to reinstall it at a later date.

It took four months, but these sights just returned with Trijicon lamps installed by Tooltech in a NP3 sight housing. It cost way too much at 262.00 plus whatever it cost me to ship the housings there; but they are quite nice.