Receiver Facing Mandrels

RECEIVER FACING MANDRELS

Brownells Receiver Facing Mandrels are designed to permit the precise squaring of the front, or face, of the forward receiver ring of a rifle action. If the face of the receiver ring is not absolutely square, it can place uneven pressure on the shank of the barrel and have a very negative effect upon potential accuracy.

m WARNING m Never attempt to disassemble or reassemble a firearm unless you are absolutely certain that it is empty and unloaded. Visually inspect the chamber, the magazine and firing mechanism to be absolutely certain that no ammunition remains in the firearm. Disassembly and reas- sembly should follow the manufacturer’s instructions. If such instructions are not immediately available, contact the manufacturer to see if they are available. If they are not available at all, then you should consult other reference sources such as reference books or persons with sufficient knowledge. If such alternative sources are not available and BROWNELLS GUNSMITHS DATA RING BINDER GUNSMITHS DATA BROWNELLS you have a need to disassemble or reassemble the firearm, you should READ & FOLLOW THESE proceed basing your procedures on common sense and experience with similarly constructed firearms. With regard to the use of these tools, the advice of Brownells Incor- INSTRUCTIONS porated is general. If there is any question as to a specific application it would be best to seek out specific advice from other sources and not solely rely on the general advice and warnings given.

HOW TO USE First, completely strip the receiver of all components as well as any sights or scope bases. In addition, the receiver should be thoroughly cleaned with special emphasis on the internal threads in the front ring. Any foreign mat- ter in these threads may cause difficulty in installing the Receiver Facing Mandrel. Next, insert the long end of the Receiver Facing Mandrel into the receiver through the front ring. When the threaded portion of the Receiver Facing PLEASE NOTE: Make all measurements for installing a new barrel AF- Mandrel contacts the threads of the front receiver ring, turn the Receiver TER facing the front ring of the receiver. We repeat: Make all measurements Facing Mandrel in a clockwise direction until it is fully seated in the receiver. AFTER facing the receiver. If you make any measurements before facing the The Receiver Facing Mandrel should be snug; there is no need to apply a receiver, the change in the length of the front ring will result in an improp- great deal of pressure in fitting it to the receiver. When the Receiver Facing erly threaded and chambered barrel blank. Mandrel is in place, its threaded portion should not exceed beyond the face In addition to serving as a means of supporting the receiver when truing of the front ring. In fact, it will normally be at least one full thread below the the front ring, there are at least three other uses for Brownells Receiver face of the front ring. The receiver is now ready to be placed in the lathe. Facing Mandrel. To set up the lathe for facing the receiver: Use a live center in the tailstock 1. It can be used to determine if the receiver is bent or warped. The Preci- with a dead center and faceplate in the headstock. Attach suitable lathe dog sion turned shank of the Mandrel should fit snugly as it extends through to the tang end (small diameter) of the Receiver Facing Mandrel, and set up the receiver. If the receiver is no longer straight, it will normally fail to pass YOUR IN THESE INSTRUCTIONS SAVE the Mandrel between the centers with the tail of the lathe dog in the face- through the rear ring. plate. Again, the forward ring of the receiver is set up facing the tailstock of 2. It can be used to serve as a support for the receiver when reshaping the the lathe, with the tang end facing the headstock. rear ring or removing the charger guide. Make absolutely sure the Receiver Facing Mandrel is securely held be- 3. Use it to support the receiver while polishing, prior to bluing or plat- tween the lathe centers. Use a suitable lathe bit to make a light surface cut ing. on the face of the front ring. Do not remove any more metal than is absolutely Reassemble the firearm according to the manufacturer’s instructions. necessary to square it up and remove any irregularities. Remove the receiver Check for proper functioning using ACTION PROVING DUMMIES. Make from the lathe and unscrew the Receiver Facing Mandrel. If the Receiver sure ALL SAFETY MECHANISMS are fully functional as designed and ap- Facing Mandrel is a bit hard to remove, use an open end or adjustable wrench proved by the manufacturer. If these tests prove satisfactory, test-fire the on the two milled flats for extra leverage. firearm with live ammunition in a SAFE and APPROPRIATE manner.