The Weaver #3B Side Mount Base (brand part number 48412) mounts a scope to the side of the receiver rather than the top, a pattern still common on lever-action and some bolt-action rifles that eject or load from the top. Machined from aluminum in a high-profile design, it lets you detach and reattach your scope in seconds without tools, so you can drop back to iron sights or a top-loading action whenever you need to. Finished in black gloss, it requires Weaver side-mount rings, sold separately, to complete the mount.

Key Specifications

• Built as the #3B application pattern.
• Mounts to the side of the receiver rather than the top.
• Lets you detach and reattach in seconds, no tools required.
• Built in a high-profile design.
• Finished in black gloss.
• Machined from aluminum.
• Requires Weaver side-mount brackets/rings, sold separately.
• Built to the Weaver-style base pattern.

Frequently Asked Questions

Do the rings come with this base? No, it requires Weaver side-mount brackets/rings, which are sold separately.

Can I remove my scope quickly? Yes, the design lets you detach and reattach in seconds without tools.

Why mount to the side instead of the top? A side mount keeps the top of the receiver clear, useful on actions that load or eject from the top.

Buy the Weaver #3B Side Mount Scope Base – Black

Keep your top ejection port clear while still running glass. Order it from our Weaver lineup, part of our scope bases selection, at our Lubbock, Texas gun shop for fast, direct shipping.