Ruger American Rimfire & Howa M1100 Picatinny Rail Fitment Guide

One EGW rail family fits Ruger American Rimfire rifles and the Howa M1100. Select the correct MOA for your normal shooting distance.

Compatible firearms

This EGW Picatinny rail fits:

• Ruger American Rimfire .17 HMR
• Ruger American Rimfire .22 LR
• Ruger American Rimfire .22 WMR
• Howa M1100

It fits Ruger American Rimfire models with wood or synthetic stocks.

Receiver-hole spacing

The center-to-center spacing between the two inside receiver mounting holes is approximately 2.513 inches.

If your receiver does not match this pattern, contact EGW Support before ordering.

Choose the correct MOA

• 0 MOA: The normal choice when most shots are taken from 0–100 yards.
• 20 MOA: Recommended when most shots are taken from approximately 150–200 yards.
• 30 or 40 MOA: Intended for advanced long-range rimfire setups beyond 200 yards. Confirm that your scope has the adjustment range needed for the selected rail.

Select the MOA for the distance where most of your shots will be taken, rather than an occasional maximum-distance shot.

Available mounts

Mount specifications

• One-piece Picatinny rail
• Machined from 6061 aluminum
• Compatible with Picatinny and Weaver-style rings
• Mounting screws and T-10 wrench included
• Recommended installation torque: 20 inch-pounds with a small amount of blue threadlocker

Before ordering

• Confirm that your firearm is a Ruger American Rimfire or Howa M1100.
• Select the MOA that matches your normal shooting distance.
• If the receiver-hole spacing does not match approximately 2.513 inches, contact EGW Support before ordering.