What's up guys I have greatly enjoyed my HK MR 556 upper. It is extremely accurate, smooth, reliable, etc. I currently have a 14.5" Geissele HK SMR on it and I put 400 rounds through it in a match this past weekend. There's only one thing I have a problem with. It is f*cking heavy...

https://www.youtube.com/watch?v=jSehsbW2Llk I think the shooter controls the recoil of the 416 in full-auto exceptionally well. (I can also highly recommend this company's holsters - I just wish they had a few more options for HK pistols!)