<p>A scope for a firearm can be used for a gun sight. The scope comprises a main tube that contains imaging optics therein. In certain embodiments, the main tube comprises a single continuous tubular body extending uninterrupted from a widened proximal end portion through a narrow medial portion to a widened distal end portion. A side focus assembly is positioned along the tubular body. The side focus assembly is used to vary the position of optics within the scope to adjust the overall focus of the scope.</p>
