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.
The different types of viruses which cause stomach flu have an incubation period. It is first important to know what a stomach flu is. Stomach flu is an inflammation of the gastrointestinal tract which involves the stomach and the intestine. It can be caused by certain viruses, bacteria, toxins, parasites, food allergies or even medication.