Ive seen the same thing and it was always bc of people closing the bolts w/o the barrels in. The handles don't really have enough mass to cause fatigue from lash.
That's my thinking what is causing it. I know I was always cautioned never to let a semi-auto shotgun slam home on an empty chamber (or EVER with the barrel removed) by pushing the bolt release. Even a good quality brand nameneeds the action of chambering a round to cushion the bolt travel.Ive seen the same thing and it was always bc of people closing the bolts w/o the barrels in. The handles don't really have enough mass to cause fatigue from lash.
Yup, KBI closed up a couple years ago.KBI is no longer in business, but you might try here for parts:
The alternative would be to have a handle made.
Jim