Anyone have pictures of shotgun scopes set up on an M4 or similar length carbine? Interested to what kind of mounts are used and how the scope sits on the flat top.

This is a simmons pro-diamond shotgun scope in an RRA mount on a flat top upper.  It works for 3-gun applications.  The eye relief works well with this setup but I don't shoot nose-to-charging-handle.  
right side closeup
left side closeup
front view of the upper

BM 20" govt. profile barrel
BM vented FF tube
BM A3 upper and bolt group
Simmons 1.5-5x20 scope
RRA 1-piece mount for 1" scope tubes
Clark/Miculek brake  
Dillon 550 toolheads and Otis cleaning kit in the background

I have a Nikon 1.5X4.5 mounted on low profiel rings sitting on a detachable riser on a flat top M&A mid length upper. Rear of scope sits forward of the charging handle, riser extends forward over the delta ring. Use 1911user's pics and move the scope about 2 1/2" forward, and you have my set up.