Abstract: A significantly simplified sight unit for a mortar is provided consisting of a gauge tool for boresight procedures containing a frame with two legs, each containing a level secured to the frame by a securing bracket. A plurality of C-brackets and screw assemblies stabilize and help further secure the levels to the frame.

Abstract: A telescopic vacuum extension member for providing a vacuum attachment having a selectable length is defined by a plurality of extension sections integrated telescopically and selectively positionable in a nested position and an extended position. Each extension section defines a hollow, conical body and includes a frictional surface and/or a flange to enable it to, when placed in either the nested position or extended position, provide seals at the top and bottom of the telescopic vacuum extension member. The frictional surfaces is operative to provide a lower seal on one hand, and an interior seal on the other and defines a raised, deformable surface which extends around the extension section adjacent to the extension section's lower rim. The flange is operative to provide a top seal and defines a deformable flap which extends around the circumference of the extension section adjacent to the extension section's upper rim.

Abstract: A boresight verification device (BVD) comprised of a circular housing with a rear portion of smaller diameter and a front portion of larger diameter. The front portion securely holds a level. The circular housing also contains a plurality of spring plungers which grip the inside of a muzzle when BVD is inserted into a muzzle for use. A tooling ball provides a stable reference point.