I have had some issues with the SS Viper tricks just not being to spec on the blades and ferrule. They won't screw flush, they are tight, but the blades are a little long and it leaves a little gap. They still work alright and spin okay surprisingly. I don't think you would have a problem with the regulars, I just doubt because of the way the standards are made they would make that mistake. I have some of the old models I have had for years and never lost one or damaged it so bad I had to throw it away, so still using them. I emailed them one time and had them send me a bunch of washers and blades so good to go....
They actually sent me some replacements for the 125 grain Vipers with the little defect, I sent them pictures. But they sent me 100 grain back, which still exhibited the problem a little but not as bad. I am using all the heads. The biggest issue with the Vipers is the tip, while designed for maximum penetration, is a little thin and can bend on a hard impact, but can usually be straightened.
I think they are still using the German Lutz blades, which I think are okay , but I always thought they lost their real keen edge easy.
When machinery is changed and or crews, and QC does not really watch close ,stuff can get out the door.