I don' t know what Dave H will say, but personally I have seen a difference between the first and last batch of Cabela' s heads. In each case, the models were the 100 gr. Super Lazer Pro Mags. The first set was great. The second set had washers that were too small to properly contain the tabs at the back of the blades. There was no way to tighten up the head and keep it aligned with the arrow. I ended up putting each washer carefully in a lathe and drilled them out to the correct size. Then there was no problem. Not a terrible problem, but they shouldn' t have come through that way, IMO.