In no circumstances must these gauges be used for No. Care should also be taken to avoid drawing the gauge back on to, and so damaging, the ejector. When closing the bolt on the gauge, the trigger should be held back to prevent cocking and snapping, which is liable to cause the rim of the gauge to be broken off.

The portion which enters the chamber is merely a guide-not a gauging feature. The diameter of the rim conforms approximately to that of a maximum cartridge. The gauges are for testing the distance of the face of the breech bolt from the end of the chamber, or, in other words, the cartridge head space. 303-inch machine- guns, with the exception of the. 1 for rifles No.1.-These gauges are used also for. Part-worn bolt-heads held as required by armourers in accordance with the foregoing need not be accounted for as part of the annual allowance of new spare parts. Bolt-heads that have been replaced in rifles by longer ones, should be kept by the armourer and used whenever possible in rifles requiring the bolt-head replaced, so as to avoid unnecessary use of new spare part bolt-heads. 1 gauge, the bolt-heads should be ex- changed among such rifles, as, owing to the varying lengths of bodies and bolts, bolt-heads which are too short in one rifle may be serviceable in another. Note.-When it is found that the bolts of several rifles turn over the 074-inch No. After fitting and adjusting, the top front edge of the face of the bolt-head is to be rounded to a radius not exceeding. Care should be taken to keep the-face of the bolt-head flat and square. F) on a flat surface, rub the face of the bolt-head on the emery cloth, maintaining a circular motion in order to preserve a flat surface, until sufficient metal has been removed to enable the assembled bolt to close over the gauge. 1 gauge should the bolt not close over the gauge, remove the bolt-head from the bolt, and having placed a piece of emery cloth (No. l.-(Spare part bolt- heads, marked “S” on the top, are longer at the front.) Assemble the bolt-head to the bolt, insert it in the body, and test with.

Long Branch, British and Savage markings available. Please specify in comments at checkout.7. Useable bolt head Good/Fair condition with deep ring around the firing pin hole (as pictured)

Lee enfield bolt head