Any help/tips to solve this one would be much appreciated:
I am trying to mount a Burris Fastfire 11 on a Mossberg 500 P/A 20G shotgun.
The Burris Fastfire 11 came with an optional Picatinny Protector Mount. See http://www.burrisoptics.com/fastfire.html
I have fitted the Fastfire 11 to the Protector Mount.
This Protector Mount 'fits all Weaver-style and Picatinny-style bases', anyway that is what it says in the brochure...
The shotgun action is drilled and tapped and fitted with a Weaver Rail.
So it should be easy to fit the Picatinny Mount to the Weaver rail, however this it where things go wrong as it doesn't fit.
The Picatinny Mount has a round screw type fitting with a nut from left to right but the Weaver mount has square cut outs. Now, a round thing never fits nicely into a squire and anyway the diameter of the round bar (with screw on the end) is larger than the diameter of the square cut-outs on the Weaver base.
Could anyone please enlighten me....? Thank you very much!
and BTW my retailer who sold me the various bits has gone out of business since the purchase.