Beretta APX .177 Caliber Blowback BB Gun Air PistolThe Beretta APX semi automatic blowback BB pistol is yet another ultra realistic airgun from Umarex USA. Originally designed as a replacement for the Beretta M9, U. S. Armed Forces standard issue, but deemed too expensive for the DOD, Beretta withdrew the APX and opted to modify the M9. As a result, the civilian world benefited by being able to purchase a mil spec pistol that was "too mil spec" for the military. Uses . 177 Caliber Steel BBs Realistic