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.
FN SCAR 1st generation prototype Caliber: 5.56 × 45mm NATO / 7.62 × 51mm NATO In November 2004, USSOCOM officially announced that FN USA won the competition for the SCAR project and had awarded FN USA a contract on November 5 to produce the second batch of SCAR prototypes for further testing and evaluation. In mid-2005, the first batch of SCAR rifles officially entered service with US special forces, and future SCAR rifles will also be produced by FNMI . Since USSOCOM uses the naval naming convention, the FN SCAR rifle is now officially designated as the 5.56mm NATO Mark 16 rifle (SCAR-L) and the 7.62mm NATO Mark 17 rifle (SCAR-H) . It is generally believed that Mk.16 and Mk.17 will gradually replace most of the rifle systems currently used by USSOCOM's forces, such as SCAR-L will replace M4A1 , Mk18 , and Mk12 SPR ; and SCAR-H will replace M14/ Mk.14 and Mk.11 . In addition, although the US Army Weapon Research, Development and Engineering Center had been supporting HK De...
M27 IAR (including M38 SPR) Caliber : 5.56 × 45mm NATO HK 's sample gun for the US Marine Corps' IAR competition is the HK416 with a 16.5-inch (about 420mm) barrel. Unlike other IAR sample guns, HK IAR does not have other special improvements (such as two firing modes like FN IAR , or a large heat sink like Colt IAR ). However, HK IAR is the lightest among all competing models, weighing 7.9 pounds (about 3.6kg) when empty, and the operation is the same as M16 . Ordinary soldiers do not need special training to master it, because HK simply directly took out one of the carbine models of HK416 to participate in the bidding. According to the Marine Corps Times on December 2, 2009 , HK IAR won the bid in this project. In May 2010, HK IAR was officially designated as M27 and has begun to be delivered to troops for trial. The Marine Corps does not require the IAR to have a quick barrel replacement function. The US military has always believed that machine guns must be able to...
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