A stent delivery system (10) for positioning a stent (18) in a body lumen and an endoscope (20) adapted to position in the stent delivery system for facilitating direct visual observation during placement of the stent. The stent delivery system includes a first conduit (12) wherein the endoscope is positionable, a second conduit (14), wherein the first conduit is positionable, function to releasably position the stent in the body lumen during use. The stent delivery system also includes a lock (16) that functions to inhibit movement of the first conduit relative to the second conduit during use. Retraction of the distal end of the second conduit, relative to the first conduit and the stern, deploy the stent in a body lumen. Indicia (36), visibly positioned on the proximal end of the stent delivery system, function to facilitate determination of an extent of deployment of the stent during use.