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Paintball markers (or guns) are an essential part of the sport of paintball. The origin of the term "marker" dates back to the early days of paintball. Originally paintball markers were actually used for marking cattle and other animals. The term has stuck, although many call them paintball guns. We prefer to call them markers.
Paintball markers are typically available in .68 calibre (normal paintballs) and .50 calibre (often called low impact paintball). You need to ensure you're buying the right calibre marker. Some markers can be swapped from .50 calibre to .68 calibre and back again with parts.