jupiterwarrior1010 wrote:The g4 a1 have a 9 inch barrel i do believe whereas the g4 a3 has a 7 inch. This was for clarification to an earlier reply.
The G4-A3 and G4-A1 use the same barrel lengths. With the barrel extension piece on, the outer barrel is about 14" long; without it is about 10" long. The RIS Unit on the G4-A3 is 7". There are different models of the G4-A1 which have different length RIS units, but they range between 9-10".