I purchased a NPM carbine a couple of years ago that someone ground off the protective ears on. I purchased an M1 Carbine front sight removal tool, which removed the sight slicker than whatever. I didn't purchase the front sight installation tool, instead just lubed the front of the barrel with some white lithium grease, and gently tapped the front sight back into position, using a brass punch and gunsmith's hammer with a piece of folded paper towel between the sight and the punch. It went on gently and smoothly, no hiccups whatsoever. When I could see daylight through the hole I reinstalled the pin to secure it.
I also had to put a new rear sight on the carbine because the Type III was busted (no adjustment). I just gently tapped it out (left to right) with that same little brass hammer with the same little piece of paper towel to help deaden the blows, it came out slick as pie. Reinstalled just as easily as the front sight did, with an original Type II. Good luck with your modification.
Chris.
