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The EOTech 557 unit is 5.7" long and the EOTech 4x Magnifier is 4.6" long, making the total EOTech 557 Package a length of 10.3 inches. You can mount this on an AR15 carry handle uning the EOTech 9-ARMS-2EXT Mount. The nose of the EOTech will hang over the edge of the rail, and your cheek will not rest on the stock to look through the unit. Best mounting for this in on a Flat Top with a Quad Rail or at least a rail that extends to the front sight mount of the rifle.