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.
pyloric. pertaining to the pylorus or to the pyloric part of the stomach. antral pyloric hypertrophy syndrome. a narrowing of the pyloric antrum caused by hypertrophy of the circular smooth muscle and mucosa; occurs most commonly in dogs of small breeds.Obstruction to gastric emptying causes chronic vomiting.yloric. pertaining to the pylorus or to the pyloric part of the stomach. antral pyloric hypertrophy syndrome. a narrowing of the pyloric antrum caused by hypertrophy of the circular smooth muscle and mucosa; occurs most commonly in dogs of small breeds. Obstruction to gastric emptying causes chronic vomiting.