I spent an inordinate amount of time working on my AR-15 rifle today.
I had to use a Dremel to cut off a lot of material from the Front Sight Base so that I could pound out the pins holding it on. Hours of Dremeling and pounding later, and I finally got it off.
I also cut off the aluminum Delta Ring so that I can bolt on my tactical forearm. (Whenever it's back in stock and I get to order it...)
Now I have the low-profile gas block on, and I just need the bolt carrier group, charging handle, and forearms to complete the assembly.