#3 – Remington Model
The iconic pump-action shotgun has seen production in the range of over 10 million since it was first introduced by Remington in 1951. The model has not been used in any major conflict but it is known for the low cost of production and extensive firing range. The Remington has still witnessed extensive use, so much so that almost half the G20 countries have this gun currently. In the US, it is used by civilians and law enforcement alike, with almost every government department using it.