I think I took some pictures of these already, but I didn't bother to look and snapped these ones anyway, I have my Colt M4 more or less how I want it, except for the crappy Airsoft magnifier on there. When I find the money, I'll get a proper Eotech one. Anyway, here are my two FDE shorties: Remington 870 and Colt M4 with a 10.5in upper.
And here they are with their full size big brothers. 18.5in Remington 870 and my Diemaco/Colt Canada SA20