POF 4 is a semi-auto weapon made by Pakistan Ordnance Factories (POF) which has been classified as a pistol after some changes in the basic select fire version. The automatic version is being used extensively by Law Enforcement Agencies (LEA). It was a few years ago that POF decided to remodel this compact machine pistol for civilian use. It is based on the H&K MP5 design and employs a delayed blow back , roller locked system. POF has been making various weapons under HK licenses, such as the SMG PK/PK1, the SMG MP5A2/MP5P3 and the G3 rifle. The civilian version dubbed as the POF 4 has a 15 round magazine, it is semi-auto (irreversible) and has no buttstock. These changes have enabled it to be classified as a pistol. A similar weapon has been exported to the US named as POF 5KX pistol (minus the front hand grip). The weapon has received good reviews in the US according to some websites. In fact some time ago POF was not selling this weapon to anyone within the country because of orders received from overseas. This may explain its popularity, perhaps.