I have a Bushmaster ORC and ive been getting frustrated with the sights. Originally I had a EOtech holo on it but I dont like batteries on my weapons so I sold it. I would really like to get some good Iron sights. I had bought some crappy UTG sights that wont hold zero and I just dont like em. I want the carry handle lol and a proper front sight but it has to be a handguard mount because I dont have a rail on my gas block or is it easy to change the gas block to the style with front sight on it already