I am new to the AR-15 world but I am in the military so I have shot my share of weapons. I have been wanting one for a while so it is time to build my own. I have searched through post on this site but there is so much information. I am looking to build a regular AR15 to shoot maybe a few times a year. I am still undecided on whether to add a handle or not. What are the perks other than the obvious? Is it better to get one with a handle or flat top for sights? Are there any good magazines to get more information? Thanks.