Quote Originally Posted by Ironman8 View Post
My honest opinion, anything over ~16" (combined length -- bbl+suppressor or muzzle device) it all becomes pretty much a wash IRT compactness and manueverability in structures and especially vehicles.

Anything under 16", every inch less will help in this regard.

If you're looking at a barrel/suppressor package over 16", then manueverability becomes second to sound suppression (IMO). In this case, I think you would do better with the 12.5 bbl + SPR/M4.

If you want to go more "high speed" and optimize a "CQB" type weapon, then there are some better barrel/suppressor combinations than the two options you've listed.
Couldnt have said it better myself. Also (im my humble opinion) the ballistics gained in a 12.5 over an 11.5 arent worth the extra inch if maneuverability is a top priority. If your case (wanting to use the SPR/M4) I can understand the argument, but I feel there are better options.