Well, my time with the thumper was rather short lived. I was only able to shoot off 1 box of the factory ammo. My wife came to me yesterday with the news of another baby, so simply put, I cannot afford to keep buying pricy ammo so I feel I should sell my upper. I originally bought this with the idea of starting reloading in mind, but now I cannot put any more money into it. So, much to my displeasure I am offering my 20" upper with a bushnell 3-9 scope for 700 + shipping. I have one 5 rd magazine and one 9 rd magazine as well as one more box of the factory ammo. Scope held up zero to the 20 rounds very well without issue.