Abstract: A machine for reaming a bore in a tubular member that includes a support block connected to a track, a holder connected to the support block, a reamer adapted to pass through at least a portion of the bore, a reamer drive for rotating the reamer, and a position drive coupled to the support block for moving the support block along the track. Also, a method of reaming a bore in a tubular member including providing a machine as described and a tubular member having a bore, securing the tubular member to the holder such that the longitudinal axis of the reamer is co-axial with the longitudinal axis of the bore, and powering the reamer drive and the position drive such that the reamer rotates and the support block moves along the track. The tubular member may be a gun barrel.

Abstract: The present invention relates to barrel extensions for firearms that have been converted to fire different, most likely lower, caliber ammunition than the firearms were originally designed to accommodate. The present invention in several embodiments is a barrel extension designed to supplement or replace the barrels and/or barrel extensions of firearms that have a sub-caliber conversion installed. Several embodiments of the present invention are configured to be installed on AR15 family rifles with a .22LR ammunition conversion to allow for accurate shooting of the .22LR ammunition through the barrel extension.

Abstract: The present invention relates to barrel extensions for firearms that have been converted to fire different, most likely lower, caliber ammunition than the firearms were originally designed to accommodate. The present invention in several embodiments is a barrel extension designed to supplement or replace the barrels and/or barrel extensions of firearms that have a sub-caliber conversion installed. Several embodiments of the present invention are configured to be installed on AR15 family rifles with a .22LR ammunition conversion to allow for accurate shooting of the .22LR ammunition through the barrel extension.

Abstract: The present invention is directed to a receiver mounting block arrangement for a rifle where the mounting block attaches to the receiver. The receiver includes scope mounting ridges adapted to receive a scope for the rifle. The receiver also includes a connection for directly receiving and securing a rifle barrel.

Abstract: A gun barrel having a generally hollow cylindrically-shaped barrel with a first end, a second end, an inner surface and an outer surface. The inner surface defines a plurality of internal spiral grooves and the outer surface defines a plurality of external spiral grooves.