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.
Stomach Location. Stomach is a muscular bag forming the most distensible part of the Human Digestive System. The regions occupied by stomach are epigastric, umbilical and hypochondriac regions. It lies between the esophagus and the duodenum on the upper-left portion of the abdominal cavity.Stomach is divisible into cardiac portion which in turn is divided into fundus and body whereas the pyloric division of the stomach is further sub-divided into pyloric antrum and pyloric canal.tomach Location. Stomach is a muscular bag forming the most distensible part of the Human Digestive System. The regions occupied by stomach are epigastric, umbilical and hypochondriac regions. It lies between the esophagus and the duodenum on the upper-left portion of the abdominal cavity.