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. Currently, GUU-5/P is gradually being replaced by the M4 series, but there are some so-called "M4" in the Air Force that are made by replacing the barrel or other parts of the M4 with the GAU or GUU. The NSN number of GUU-5/P is 1005-01-042-9820, which is the same as the original GAU-5/P.
GUU-5/P in various styles and with additional engraving
A U.S. Air Force security guard in Panama in 1998. This is a straight-barreled GUU-5/P
In 2001, an Air Force security guard played a terrorist in an exercise. This was also a straight-barreled GUU-5/P.
A U.S. Air Force UXO personnel is shooting with a GUU-5/P. He is firing blanks, possibly during an exercise.
A U.S. Air Force sergeant in Guam is practicing shooting with a GUU-5/P with an M4 barrel.
Also at the U.S. Air Force base in Guam, the GUU-5/P in this picture uses a straight barrel
The GUU-5/P carbine in the hands of this Air Force special forces soldier is a combination of an M16A1 receiver and an M4 barrel.
The rifle used by this US Air Force Special Forces soldier is a GUU-5/P with an M4 upper receiver replaced and a 610 lower receiver.
In 1996, a U.S. Air Force base security officer was training. Note that his GUU-5P was a GAU-5/A or GAU-5A/A modified with an M4 barrel (DVIC)
An Air Force security guard at Fort Dix, New Jersey, uses a GUU-5/P during a DVIC training exercise in June 2000.
After the Iraq War ended in 2003, the engineers of the US Air Force EOD (Unexploded Ordnance Disposal Team) responsible for clearing unexploded ordnance in Iraq also seemed to use the GUU-5/P, but its barrel was still a thin barrel, and it used the M16A1's front sight.
SOPMOD M4 Caliber: 5.56 × 45mm M855 In view of the fact that many manufacturers that provide various sights, lights and other tactical accessories for carbines have not had a mounting interface mark for a long time, USSOCOM (U.S. Special Operations Command ) began to try to develop a set of close-combat carbines in September 1989 . The accessory interface standard was adopted, and the project name SOPMOD was officially proposed on May 15, 1992. SOPMOD means "Special Operations Peculiar Modification". This is the collective name for a series of equipment with the M4A1 rifle as the core. The derivative models such as Mk.18 CQBR and Mk.12 SPR that were later developed on this basis are actually part of SOPMOD. However, when the types of guns equipped increased, in some special forces, everyone used to use the abbreviation SOPMOD. Represents the M4A1 with ...
AR by LaRue Tactical Caliber: 5.56 × 45mm NATO 7.62 × 51mm NATO The boss of LaRue Tactical is Mark LaRue. In 1980, he started a small workshop using CNC machine tools to produce and sell competition-level AR parts. Initially, he only made some small parts such as scope mounts. In 2006, he began to produce his own competition-level upper receivers, and then added his own lower receivers, so he simply launched his own competition-level AR complete gun. Their products are mainly in two calibers: 5.56 NATO and 7.62 NATO. The latter adopts the AR10 design. The main product is the OBR series ( Optimized Battle Rifle ). It is said that good shooters can easily achieve 1/2 MOA accuracy using OBR with competition bullets. In 2011, the weight-reduced OBR PredatAR series was launched, which is said to have a 1 MOA level. Compared with the PredatAR series, the OBR series uses a heavy barrel, while the latter has a barrel diameter reduced by 0.75 inches. In addition, the Picatinny rails ...
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