Is there such a thing as a weaver base you can use on a 2300 for attaching a holo site on?
Yes, lots of options:
http://images.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGLL_enUS386US386&q=3%2f8+to+weaver+dovetail+mount&biw=1549&bih=635&sei=F_6XUbbxCKPk4AO0mYDABQ&tbm=isch (http://images.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGLL_enUS386US386&q=3%2f8+to+weaver+dovetail+mount&biw=1549&bih=635&sei=F_6XUbbxCKPk4AO0mYDABQ&tbm=isch)
thanks 007
Here is the type i like it keeps the scope/ red dot low.
Mike
http://www.pyramydair.com/s/a/Hawke_Sport_Optics_2_Pc_Adapter_3_8_to_Weaver_Rail/4162 (http://www.pyramydair.com/s/a/Hawke_Sport_Optics_2_Pc_Adapter_3_8_to_Weaver_Rail/4162)
https://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGLL_enUS386US386&q=3%2F8+to+weaver+dovetail+mount&biw=1549&bih=635&sei=F_6XUbbxCKPk4AO0mYDABQ&tbm=isch#imgrc=Ai64xCqis_MiuM%3A%3BzJUNf_Zv-7vNPM%3Bhttp%253A%252F%252Fdi1-4.shoppingshadow.com%252Fimages%252Fpi%252F54%252Fac%252F90%252F124693460-260x260-0-0_utg%252Butg%252B3%252B8%252Bdovetail%252Bto%252Bweaver%252Bpicatinny%252Brail%252Badap.jpg%3Bhttp%253A%252F%252Fwww.shopping.com%252Futg-utg-3-8-dovetail-to-weaver-picatinny-rail-adapter-2pcs%252Finfo%3B260%3B260 (https://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGLL_enUS386US386&q=3%2F8+to+weaver+dovetail+mount&biw=1549&bih=635&sei=F_6XUbbxCKPk4AO0mYDABQ&tbm=isch#imgrc=Ai64xCqis_MiuM%3A%3BzJUNf_Zv-7vNPM%3Bhttp%253A%252F%252Fdi1-4.shoppingshadow.com%252Fimages%252Fpi%252F54%252Fac%252F90%252F124693460-260x260-0-0_utg%252Butg%252B3%252B8%252Bdovetail%252Bto%252Bweaver%252Bpicatinny%252Brail%252Badap.jpg%3Bhttp%253A%252F%252Fwww.shopping.com%252Futg-utg-3-8-dovetail-to-weaver-picatinny-rail-adapter-2pcs%252Finfo%3B260%3B260)
the hawke is nice looking
If you do get those Hawke Sport Optics 2Pc adapters make sure you lube the screws with something like 'Never-Seize' as they can be a real PITA trying to get them tight and an even bigger PITA when you try and loosen them.
Carl
Those Hawke style are my favs and of the low or zero profile ones, they work the best with one piece holo type sights. As Carl said, the screws they come with suck. I've had several heads strip or worse...shear completely off. I don't know if they are aluminum (like the adapters) or they are just low quality steel. I bought a box of quality ones from McMaster Carr and replaced all of them.
They are cheaper here:
http://www.amazon.com/Hammers-Adapters-Crossbows-Airguns-Dovetail/dp/B002DQWRLE/ref=sr_1_29?s=sporting-goods&ie=UTF8&qid=1368984943&sr=1-29&keywords=global+sportsman+adapter (http://www.amazon.com/Hammers-Adapters-Crossbows-Airguns-Dovetail/dp/B002DQWRLE/ref=sr_1_29?s=sporting-goods&ie=UTF8&qid=1368984943&sr=1-29&keywords=global+sportsman+adapter)