Far and away, the most modified bolt action rifle is the venerable Model 98 Mauser. Not that the design had any deficiencies as a military rifle, but if you want to attach a scope, the straight bolt handle needs some alteration for easier operation and scope clearance.
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
Alterations of rifle bolts should be done with great care, especially if
intense heat is used for welding, soldering, or brazing. The heat treatment
of the locking lugs as well as other critical areas of the bolt such as the
cocking cam must not be altered.
Removing or installing a rifle barrel is a common gunsmithing task,
yet it can sometimes be quite difficult. In addition to problems caused
by the tight fit of the barrel threads in the receiver, the gunsmith may
encounter problems directly related to his action wrench.
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