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.
Gastritis is actually the inflammation of the stomach lining, while ulcers occur when the stomach lining develops holes through which the acid burns the stomach. Gastritis is a medical condition in which the internal stomach lining becomes inflamed or swollen due to excessive production of stomach acid.reatment for the condition usually includes antacids (to reduce production of stomach acid), avoiding hot and spicy food, antibiotics (incase of bacterial infection) and lifestyle changes. Ulcer is a disease that is caused by bacteria, Helicobacter pylori (H. pylori) bacteria to be exact.