It only takes a few minutes to produce a barrel in this way but the machinery is very expensive, which is why only larger manufacturers use this method. Button-rifled barrels are also made by drilling, grinding and polishing. The rifling pattern is then pressed into the barrel with a tool called a button. Afterwards the barrel is polished with a lead rod and grinding paste.
An antrum is a cavity or chamber, such as the antrum of the lower  part of the stomach. Erosion means that the lining is thinning,  resulting in inflammation and irritation.â¦ Erythema describes a  reddening of tissue due to irritation or injury. (MORE) 25 people found this useful.
â¢ Body (corpus): The main part of the stomach, between the upper and lower parts â¢ Antrum: The lower portion (near the intestine), where the food is mixed with gastric juice â¢ Pylorus: The last part of the stomach, which acts as a valve to control emptying of the stomach contents into the small intestine.ypes of stomach cancers Different types of stomach cancer include: Adenocarcinoma About 90% to 95% of cancers of the stomach are adenocarcinomas. When the term stomach cancer or gastric cancer is used, it almost always refers to an adenocarcinoma.