Jeep,
I've had this Beretta grip Sub-2000 for a while now, but wanted to add a red-dot (never got comfortable with the original sights). Since the Subbie is a folder, I wanted something that would be removable for folding, but would retain zero between uses.
The folding scope mount Keltec offers wasn't an option as it only accomodates 1" scope tubes & the spacing is all wrong for a red-dot. I had seen a posting from someone who said they had used a Weaver Converta-mount intended for a Mossberg 500 on theirs & decided to try that route myself ... anyway, this is my implementation of the Mossberg 500 version Weaver Converta-mount on my Sub-2000.
I used stainless hardware for the attachment. 8/32 allen head screws and nylon insert lock nuts with washers.
I considered a few ways to handle dealing with the compound slope of the forestock (life would be too easy if it was straight & square). I even played around with using aluminium tape to build up a shim for the difference. I ended up falling back to a more simple approach. I used thin washers between the base plate and forestock on three of the four mounting screws (one on top rear & lower front, and two on the top front). The result is completely firm.
I think the alignment looks pretty good. I'll have to wait until some better weather permits a range trip for zeroing to see how well it really works...
It still folds fine with the scope rail dismounted.
followup: finally got out to the range to try things out. Zeroed without much trouble (Yay!) and holds the zero between dismounts & remounts.
These pics are a before & after dismout/remount of the scope rail with attached red-dot ....
Nick