A culverin was a relatively simple ancestor of the musket, and later a medieval cannon adapted for use by the French as the "couleuvrine" (from couleuvre "grass snake") in the 15th century, and later adapted for naval use by the English in the late 16th century. The culverin was used to bombard targets from a distance. The weapon had a relatively long barrel and light construction. The culverin fired solid round shot projectiles with a high muzzle velocity, producing a relatively long-range and flat trajectory. Rounds shot refers to the classic solid spherical cannonball.Jim, I was thinking it just might be a culverin of some sort. I haven’t seen one with the curved extension, though. When I look at Andrey’s (@Mr.Deep), I believe he cut off the extensions and rounded them off to form a knob (button) for his SR. Then he constructed new carriages. Andrey also gave a run-down of how many guns of what kind were on the original SR. The kit doesn’t have places for all the smaller guns on the upper decks (6 and 8 pounders). I’m thinking about ordering some of those guns if I can find them and carriages to go with them. I’m not prepared to make my own carriages from scratch yet. In the mean time, I’ll use kit provided guns without rigging and replace them when I get new ones.
Because of a tale, it let me think that is culverin. They are very simple guns and can be simply adapted to any carriage. The carriage images provided by Kurt are more authentic but belongs to1500.