Scopes In Blender

[Aerodynamic]

I'm modeling a gun right now, and I would like to know how to take a cylinder, extrude, make a small hole, and go straight through the center of the cylinder, like a ACOG scope. I got the extruding part, I just need to find out how to get it where you can see straight through the part.

NOTES:

• I'm using Blender version 2.66 (Yes, I understand the exporting process)
• Sorry if I am sorta unclear about things, I tried my best :[

[Ad Bot]

[Demian]

Select the edge loop at the end of the cylinder, extrude, scale down, extrude, move inwards/towards the start of the cylinder, and fill the gap.