Have you looked at the Kel-Tec SU-16C? It has a 16" bbl, with a flash-hider option(Comes with only a thread guard cap), folding stock that allows 30rd. AR-15 mag to be used. The factory forend opens to a bipod, but there is tactical option fore end that adds rails. I took that route, adding a light, foregrip, tactical light and sling swivel. Top rail is topped with a Bushnell Holosight, same 1-MOA circle/dot reticle as Eotech, but 1/2 weight, uses same "N" batteries(Cheap at Home Depot/Lowes-don't go to a drug store 200% higher). Don't have tape in hand, but I think it folds to close to 24". As for accuracy, I acquired some WW RAnger LE 60gr. Nosler ammo. I got 1MOA @ 100 yds with it! Shot lots of other stuff before this and really never had bad accuracy with anything., The 60GR Noslers just really shot well. Further research on LE Forums and such revealed that that load pentrated almost was well as .308 ammo! The Red Dot sight is as asset too, when you see the dot on the target with both eyes open thru the reticle, you will hit it.