So I bought my first ar15 and I got just an entry level Stag Arms 15 m4. I was looking to do just a little upgrading to it, like the grip, the charging handle and any other suggestions you guys with more experience may have. I am not a professional shooter and not looking to break the bank. I am very new to the platform so I would just like a little help. I don't know what fits and what doesn't. Thanks.