The Forster 30 M1 Carbine Go Gauge (brand part no. HG0030G) is a precision steel headspace gauge sized for the 30 M1 Carbine chambering found in M1 Carbines and their civilian clones. Forster Products machines it to a fixed 1.29-inch length representing the minimum acceptable headspace; the bolt should close freely on this gauge in a properly finished chamber. It’s the baseline half of a standard headspace check, used alongside a no-go gauge whenever a barrel is fitted or a carbine’s chamber needs verification. Add it to the rest of our gunsmithing tools and gunsmith supplies for M1 Carbine repair and rebuild work.

Key Specifications

• 30 M1 Carbine Chambering Ground to the exact minimum headspace dimension for this cartridge.
• Go Gauge Type Confirms the chamber is cut deep enough for a properly dimensioned case and normal bolt closure.
• 1.29-Inch Gauge Length A fixed, precision-ground reference length for a repeatable check.
• Steel Construction Hardened steel that holds its critical dimension through repeated use.
• Single-Piece Gauge Sold individually for use alongside a no-go gauge during inspection.

Frequently Asked Questions

When is a go gauge check needed on an M1 Carbine? Any time a barrel is replaced or fitted, or when verifying a rebuild before the carbine goes back into regular use.

What if the bolt doesn’t close on this gauge? The chamber hasn’t been reamed deep enough yet and needs further work before the carbine is ready to fire.

Buy the Forster 30 M1 Carbine Go Gauge, Steel

Confirming minimum headspace is a required step on any Carbine rebarrel job. Order this go gauge from our Lubbock, Texas gun shop for fast, insured shipping to your bench.