long-bore

One carried what appeared to be a long-bore assassin's rifle.

Gregory Benford women with long-bore weapons slipping down side streets, quick-eyed and edgy, clearing the way.

As such, diesel engines in the late 19th and early 20th centuries used the same basic layout and form as industrial steam engines, with long-bore cylinders, external valve gear, cross-head bearings and an open crankshaft connected to a large flywheel.