i only have one mechanical error....last year buck standing broadside at 43 yards....hit just a tad low right behind the shoulder ( i was still hunting) deer went about 30 yards and layed down. Upon skinning him i looked at the pass through and noticed that only 2 blades opend out of the 3 blades...upon exit all 3 where open.....it is a shockwave 125......i have shot that same broadhead into 3 other deer with it opening each time, no broken blades either.....