The Leupold Standard two-piece base for Ruger American RF rimfire rifles (part no. 170489) gives small-caliber shooters a low-profile, receiver-mounted platform sized specifically for rimfire actions rather than a scaled-down centerfire base. Leupold builds the base from steel with a matte black finish to reduce glare, and a pivoting front dovetail ring allows lateral bore-sighting adjustment alongside the rear windage screws. The base accepts STD rings in five heights, giving flexibility to match a range of rimfire scopes. Among rimfire-specific scope bases, this Ruger American RF configuration is built for calibers under .300 Win. Mag.

Key Specifications

• The base is constructed from steel, offering durable support for mounted optics.
• The finish is matte black, reducing glare and blending with common rifle finishes.
• This mount installs to the receiver, providing a low-profile, secure interface for scopes.
• The design is a two-piece base, simplifying installation and alignment.
• Rings are not included, so buyers must select rings that match their optic.
• The base is intended for rimfire rifles, delivering a mounting solution tailored to small-caliber platforms.
• It is compatible with calibers under .300 Win. Mag., accommodating most standard chamberings below that threshold.
• The front dovetail ring is a pivoting dovetail, enabling lateral adjustment during bore sighting with the rear windage screws.
• The base accepts STD rings in five heights, giving shooters flexibility to choose optimal optic height.

Frequently Asked Questions

Why does a pivoting front dovetail matter? It allows lateral bore-sighting adjustment before the scope’s own windage is used, simplifying initial setup on a rimfire rifle.

How many ring heights does this base support? Five STD ring heights, giving flexibility to match different rimfire scope objective sizes.

Buy the Leupold Base, Ruger American RF

Rimfire rifles deserve a base sized for their platform, not a centerfire mount pressed into service, and this Ruger American RF base is built exactly to that spec. Order it from our Lubbock, Texas gun shop and it ships fast.