The Forster 22 Long Rifle Field Gauge (brand part no. HG22RIMF) is a precision steel headspace gauge built for rimfire actions, checking whether a 22 LR chamber has worn past a safe service limit. Forster Products machines it to a fixed 0.049-inch dimension appropriate to rimfire headspace tolerances, which run far tighter than centerfire cartridges since the case rim itself sets the seating depth. If the bolt closes on this gauge, the chamber or breech face has worn enough to warrant a closer look, since excess rimfire headspace shows up quickly as light strikes or case-rim damage. It’s a useful addition to the rest of our gunsmithing tools and gunsmith supplies for anyone servicing rimfire rifles.

Key Specifications

• 22 Long Rifle Chambering Ground specifically to rimfire headspace tolerances, not a centerfire dimension.
• Field Gauge Type Represents the maximum service-limit headspace for a rimfire action already in use.
• 0.049-Inch Gauge Dimension A fixed, precision-ground reference appropriate to rimfire tolerances.
• Steel Construction Hardened steel built to hold its exact dimension through repeated use.
• Single-Piece Gauge Sold as one gauge for the field-check step of a rimfire headspace inspection.

Frequently Asked Questions

Why does rimfire headspace work differently from centerfire? A rimfire case headspaces off its rim against the breech face rather than the shoulder, so the tolerances involved are much smaller and wear shows up faster.

What are signs I might need this check? Light strikes, sluggish extraction, or visible case-rim deformation on fired brass are all reasons to check rimfire headspace.

Buy the Forster 22 Long Rifle Field Gauge, Steel

Rimfire actions wear differently than centerfire rifles and deserve their own check. Order this field gauge from our Lubbock, Texas gun shop for fast, insured shipping to your bench.