http://www.opticsplanet.net/egw-cva-...ount-2476.html
I am sure a lot of guys here have the Optima,Accura, and find the facotry LOP are made for Giants 14 1/2"
I find the above mount to work great,but there a draw back you will need to drill a extra hole to get the base mount back over the firing pin housing .The base is undercut out so there will no problems in opening and closing the rifle.I have a 13 1/4" LOP
The base will except weaver rings and if needed a little more for eye relief you can order the weaver off set extension rings that will give another 3/4" to the rear.
I would drilling a extra base screw mount will give you 3 screw hold down.I don't think the base will move with lock tight.
I also think the 2 screw with lock tight won't move either .I have a t/c thunderhawk that comes with split bases and only has 1 screw hold on each front and rear base .I can say the 12 years it has never moved on me.
Happy holidays