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The pintle cradle is removeable from the arm. It is not highly finished and something an ordinary machine shop could fabricate with stock materials.

The construction is a 7/32" steel U-channel 4 5/8" tall, 3" outside width, 2 1/2" inside width and 2 1/2 front to back. Hidden in Rob's picture is a solid plug that fits into the top of the arm. It is 1 1/4" dia bar welded to a hole centred in the bottom of the cradle. The plug has a chamfer on the bottom edge to slide easily into the arm. Finally it has a machined 3/8" half round groove the bottom lip of which is 1" from the cradle. (That is easier than trying to measure the centre of a groove and converting to 16ths of an inch.) The overall measurement of the plug is 1 1/2" from the cradle.

The only other finishing touch is a relieved 1/2" through hole for the machine gun mounting bolt. Measure down 1" from the top of the U, and in 7/8" from the edge. Because this is the only hole, it fits the gun either way.