Once more, a quick review for a quick upgrade; Quickboost has provided 12 miniscule Resin gun barrels with oval cooling vents for use with the Airfix Lancaster B II. This is the Hercules radial-engined Lancaster release, but the gun barrels will work on this kit and their recent other Lancaster B I and III Merlin engine released kits as well. As noted in my other review of the .303 barrels with round holes, these should work on just about any aircraft requiring .303 gun barrels. As a note, the oval perforation gun barrels are slightly shorter than the round perforation barrels.
The muzzles are hollow, and the simulation of the oval perforations is well done. In my case, painting them black then using the side of a #2 pencil and (GENTLY) polishing with a soft cloth, I was able to bring out the detail.