If chamber headspace is excessive, the gun should be taken out of service until it has been inspected and repaired by a competent gunsmith. If a rifle closes on a FIELD gauge, its chamber is dangerously close to, or longer than, SAAMI’s specified maximum chamber size. FIELD: Corresponds to the longest safe headspace.The NO-GO gauge is a valuable tool for checking a newly-reamed chamber in order to ensure a tight and accurate chamber. To determine if there is excessive headspace, the chamber should then be checked with a FIELD gauge. If a rifle closes on a NO-GO gauge, it may still be within SAAMI specifications or it may have excessive headspace. NO-GO: Corresponds to the maximum headspace Forster recommends for gunsmiths chambering new, bolt action rifles.Although the GO gauge is necessary for a gunsmith or armorer, it usually has fewer applications for the collector or surplus firearms purchaser. The GO gauge is essential for checking a newly-reamed chamber in order to ensure a tight, accurate and safe chamber that will accept SAAMI maximum ammo. If a rifle closes on a GO gauge, the chamber will accept ammunition that is made to SAAMI’s maximum specifications. GO: Corresponds to the minimum chamber dimensions.In order from the shortest to longest, they are: GO, NO-GO, and FIELD: Pacific Tool and Gauge offers three lengths of headspace gauges per rifle caliber. Remington Model 7 Receivers and Actions.Remington Short Chambered or Stock Ready Barreled Actions.Remington Actions - Blueprinted & Custom.Remington Barreled Actions - Actions - Recievers.Actions, Bolts, Bottom Metal, Fire Arms, and Magazines.High Speed Steel (HSS) Dovetail Cutter.4 Flute - Double End Ball Nose Carbide Mill Cutters.4 Flute - Single End Ball Nose Carbide Mill Cutters.4 Flute - Double End Square Carbide Mill Cutters.4 Flute - Single End Square Carbide Mill Cutters.2 Flute - Double End Ball Nose Carbide Mill Cutters.2 Flute - Single End Ball Nose Carbide Mill Cutters.2 Flute - Double End Square Carbide Mill Cutters.2 Flute - Single End Square Carbide Mill Cutters. ![]() Shotgun / South American and European Big Bore Headspace Gauges.(SAAMI) Centerfire Rifle Headspace Gauges.(SAAMI) Centerfire Pistol & Revolver Headspace Gauges.Bushing Sets For Chamber Reamers and Barrel Tools.Single Bushing For Chamber Reamers and Barrel Tools.
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