US Air Force GUU-5/P Carbine
US Air Force GUU-5/P Carbine Caliber: 5.56 × 45mm M 855 By: The Texas Gun Vault The US Air Force has been using GAU-5/A , GAU-5A/A and GAU-5P until the late 1980s and early 1990s. As the M16A2 firing the M885 bullet began to serve and the barrels of many GAU rifles in the Air Force had reached the end of their service life, the US Air Force began to gradually improve the existing GAU rifles to GUU-5/P (note that there is a slash in front of the P here). The improvement mainly replaced the 14.5-inch barrel with a twist rate of 1/7 to fire the M885 bullet. There is a bayonet catch under the front sight (but the US Air Force still does not have bayonet training). Such a modification is obviously a cost-saving approach. The M16 receiver is not stressed, and it is no problem to fire 100,000 rounds (thanks to Chris Hazell and Zhonghua Wenrou for providing information) . Since the GUU-5/P is directly improved from the GAU-5 series, it still does not have an auxiliary push handle. Curre...