18″ Springfield Scout Squad rifle in a Rogue bullpup stock.

In the two views, you can see the “belt and suspenders and then some” approach to sighting — 4-16x scope and red dot (both Vortex) plus offset Dueck iron sights, all usable without having to remove or shift anything. The resulting rifle is a pound heavier than the similarly equipped M1A would have been but nearly a foot shorter.