The info I was able to find from Stoeger says the correct model for the M3000 is: KK-G5-HMRXP1-80210
Also it states that it is compatible with rifles that have serial #'s after 1368845. If your rifle precedes that # you need #6-48 screws which are here: 37E-RA-RPLCK-306-26
.4" (Top of Receiver to Top of Picatinny)
This model is for the Remington 788: KK-T8-REM700-40400
6.276" inches long
20 MOA rails are angled down slightly to give your scope more field of view at longer distances. If you ever plan on shooting past 500 yards then it'd be smart to get a 20 MOA base. If you never plan on going past that then you can get away with a 0 MOA scope.
I was unable to find something in silver. I attached a link below to a compatible product.
https://www.opticsplanet.com/evolution-gun-works-remington-710-770-picatinny-rail-scope-mount-aluminum.html
This base will work on the Remington SPS Tactical.
Domestic 6061 T6 Extruded Aluminum
These only come with #6-48 screws, but you can order the rails with the #8-40 screws here: https://www.opticsplanet.com/evolution-gun-works-hd-remington-700-721-725-bergara-premier-picatinny-rail-scop.html
Yes, this should fit the B14 as well.