The Forster 30-40 Krag Go Gauge (brand part no. BG3040G) is a precision steel headspace gauge that confirms a 30-40 Krag chamber has been cut deep enough for the bolt to close properly on a correctly dimensioned case. Forster Products machines it to a fixed 1.19-inch length representing the minimum acceptable headspace; the bolt should close freely on this gauge on a properly finished chamber. It’s the baseline check used alongside a no-go gauge when fitting a new barrel or verifying gunsmith work on this older military chambering. Stock it with the rest of our gunsmithing tools and gunsmith supplies for rebarrel and repair work.

Key Specifications

• 30-40 Krag Chambering Ground to the exact minimum headspace dimension for the 30-40 Krag cartridge.
• Go Gauge Type Confirms the chamber is cut deep enough for a properly dimensioned case to seat and the bolt to close normally.
• 1.19-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 in a complete headspace check.

Frequently Asked Questions

What does it mean if the bolt won’t close on a go gauge? It means the chamber hasn’t been cut deep enough yet and needs further reaming before the rifle is ready for use.

Do I need both a go gauge and a no-go gauge? Yes, a proper headspace check brackets the acceptable range from both ends; a go gauge alone only confirms the minimum side.

Buy the Forster 30-40 Krag Go Gauge, Steel

Confirming minimum headspace is the first half of getting a Krag rebarrel job right. Order this go gauge from our Lubbock, Texas gun shop for fast, insured shipping to your bench.