The Chropi GP10 was a subachine gun built by Chropei (which used the "Chropi" spelling on its weapons), a Greek chemical company. It was designed by a team under Mr. Sotiris Sofianopoulos - apparently based on an original Greek-Cypriot design - and was proposed to the Greek Army in 1975. Initial "positive" performance results during tests were replaced by a final rejection of the gun with dire consequences for the company, which had improved its existing infrastructure in order to massively produce the weapon. About 100 units had been produced, which were delivered to the Greek state and ended up in Greek Army storage facilities. This article or section does not cite any references or sources. ... This article does not adequately cite its references or sources. ... The word calibre (British English) or caliber (American English) designates the interior diameter of a tube or the exterior diameter of a wire or rod. ...

References

• Theodoros Dimopoulos, "Opla Ellinikis Epinoisis kai Kataskevis (Greek-developed and produced Arms)", article in Greek Panzer magazine, issue 24, January-February 2006.