Got to shoot the new HK 416 D today, what a sweetheart of a rifle! Borrowed the reflex sight off a Sig air rifle, and it seemed very accurate for a first day at the range, out of 300 rounds of Federal Blazer, it only failed to fire once. ( early on, I think it didn't go fully into battery.) Making plans to be at the next Rimfire Challenge, this is going to be fun!