Reflex sight mount options - youth model 20ga Remington 870 and Benelli Nova

[drakehammer]

Is there a company that makes a saddle mount specifically for youth models in 20 gauge Rem 870 and Benelli Nova?

If not, what is the best way to mount reflex sights on these youth model shotguns? I'm not opposed to having the receiver tapped/threaded. 

Thanks in advance

[SumToy]

what sight you want to run.  We run the burris.      Our base works with the burris and vortex

[drakehammer]

Burris FF3 is what I have on hand. I haven't seen what y'all do. I'm guessing tap and thread the receiver and mount a rail?
Thanks

[SumToy]

Our base is all you need.