These are some pictures I took when I was doing the dremel trick, I find on the front handguard cap on the A2 sight cut 3 or 4 slits around it about 1/2 to 3/4 way in then use lineman pliers and just get one good bend and it breaks apart. These pictures are from the install of the Troy extended carbine battle rails, was tighter than the Samson rails I am used to using, but everything fit perfectly with just a little tap from nylon hammer.