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From the legendary M1 Garand to today’s M4 and M16 rifles, standard-issue infantry rifles have been the ubiquitous icons of the troops who carried them. But throughout America’s wars, some decidedly non-standard small arms have been put into service when a particular situation or circumstance calls for a unique weapon.

1. Stinger Machine Gun

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This World War II weapon originated not from American arms designers or military ordnance boards, but from the creative minds of a few Marinesfrom the 5th Marine Division. Using salvaged versions the aircraft mounted version of the Browning M1919 machine gun called the ANM2 (pictured above), the Stinger was constructed using an M1 carbine stock, a simple trigger, a Browning automatic rifle bipod, and an improvised 100-round box magazine. Because it was based off the ANM2, the Stinger’s rate of fire was over 1200 rounds per minute, three times that of the normal M1919. It was truly devastating firepower in a infantry-portable package. One Marine, Cpl. Tony Stein, would demonstrate the Stinger’s effectiveness during the Iwo Jima landings on Feb. 19, 1945.

During the initial amphibious assault, Stein single handedly used his Stinger to suppress and assault multiple enemy pillboxes. Shedding his boots and helmet to move faster, Stein made eight trips back and forth across the beach, retrieving more ammunition and evacuating the wounded. For his actions with the Stinger, Stein was award the Medal of Honor, which he received posthumously after being killed in action on Mar. 1.

The Stinger was a rare weapon; only six were ever made, and no surviving examples exist today. But is was a testament to the ingenuity of crafty and creative enlisted troops who wanted to get new capabilities out of their small arms. The Stinger also foreshadowed the concept of the medium or general purpose machine gun, exemplified today in weapons like the 7.62x51mm M240 machine gun.

2. M3 Carbine

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While it may seem like a Buck Rogers sci-fi prop, this weapon system was ahead of its time. It originated as an protype late in World War II. Provisionally called the T3, the system consisted of early versions of an image intensification scope and infrared illuminator mounted on a custom-built M2 carbine and powered by an external backpack battery. Several T3s served during the invasion of Okinawa, inflicting a significant number of casualties on the Japanese forces, and was effective against night infiltrations of American lines. After the war, an improved version that could be mounted on standard M1 and M2 carbines using a conversion kit was developed. Type classified the M3, it also sported improved optics, increasing the view range to 125 yards. M3s also saw use in the Korean War, but the M3 never was popular with troops; the heavy battery pack, fragile electronics, and the underpowered .30 caliber round didn’t sell troops to the idea of turning a six-pound rifle into a 34-pound monster. But the M3 demonstrated the potential of a night-fighting weapon, setting the stage for today’s infrared and thermal optics systems.

3. SOG-Modified RPD Machine Gun

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The RPD machine gun is normally associated with the of the early Soviet military and various third-world arsenals. Nevertheless, the weapons got some unconventional modifications from an unconventional American unit. During the Vietnam War, Military Assistance Command, Vietnam established a “black” special operations group under the innocuous sounding designation of Studies and Observation Group; the new unit consisted of Army Special Forces, Navy SEALs, and Marine Force Reconnaissance personnel. In 1965 and 1966, this unit was given permission to begin cross border operations into Laos and Cambodia, with the objective of observing and interdicting logical operations on the Ho Chi Minh trail. Given the covert nature of their missions, SOG operators often carried non-U.S. weapons into the field.

The RPD was a gas piston-operated machine developed at the tail end of World War II by Soviet small arms designer Vasily Degtyaryov. It was chambered in the same 7.62x39mm intermediate rifle as the famous AK-47. Given its place in Vietcong and North Vietnamese hands, the RPD was suited for SOG’s unconventional needs, but went a step beyond. SOG operators cutthe RPD’s barrel down to the end of the gas tube and shortened the stock, bringing the overall length down to just 31 inches. SOG also modified the RPD’s drum magazine to hold 125 rounds instead of the usual 100, as well as adding a piece of linoleum to muffle rattling inside the drum. These modifications created a compact, yet still controllable machine gun that only weighed 12 pounds. For a small, outnumbered SOG recon team trying to break contact with pursuing forces, the custom RPD was the last word in portable firepower.

4. China Lake Grenade Launcher

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The Vietnam War saw several evolutions in grenade launchers. The M79 replaced old rifle muzzle spigot-type launchers, and the underbarrel mounted XM148 launcher entered testing. But some special operations units still weren’t satisfied. SEAL teams operating in Vietnam used both the M79 and XM418, but found the single-shot capacity lacking. A magazine-fed launcher proved unreliable. The SEALs asked for a better weapon.

What they got was a cross between a grenade launcher and a shotgun; the user cycled new rounds into the chamber like a pump-action shotgun. Never given an official designation, the weapon was named after the China Lake Naval Weapons Center where it was developed. The China Lake carried three 40 mm grenade rounds in the shotgun-style magazine tube, plus one in the chamber. With the China Lake, SEAL teams could deliver multiple frag grenades in a matter of second, well suited for conducting ambushes and destroying enemy fighting positions. Despite its quality, the China Lake never quite evolved past the experimental phase; revolver-style grenade launchers offered more ammo capacity than the shotgun design. But the role of the China Lake endures in weapons like the M32 Multi-Grenade Launcher, providing a rain of explosives at a moment’s notice.

5. Stoner 63 Modular Weapons Systems

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This weapon system came from legendary American arms designer Eugene Stoner, creator of the original Armalite AR-15 rifle, which was later adopted by the military as the M16. Stoner’s next project after leaving Armalite was a modular weapon system developed with Cadillac Gage: a 7.62×51 mm caliber weapon that could be configured as a rifle, carbine, or machine gun. When Stoner and his design team saw the growing popularity of the 5.56 x 45 mm caliber, they switched away from the heavier 7.62 mm round.

The Stoner 63 system featured a variety of different subassemblies, that enabled a variety of configurations. A full-size rifle, a compact carbine, even a solenoid-fired vehicle machine gun were available. But the most popular version of the Stoner 63 was the light machine gun. Special operations units like the SEALs and Marine Force Reconnaissance prized the 63’s light weight — it was 11 pounds lighter than the standard M60 machine gun. The weapon’s 5.56 mm caliber was also significantly more controllable than the heavier 7.62 rounds of the M60.

The Stoner 63 family got attention from the Marine Corps, which conducted testing with the various configurations from 1963 to 1967. It got positive reviews in boot camp training environments and performed well in limited combat trials. But the Army disagreed, with Army Weapons Command electing to stick with the M16.

While the SEALs had an appreciation for the weapon, its complicated assembly and fussy maintenance requirements meant that it would never see wide acceptance outside special operations circles. But its modular design was a revolutionary approach to small arms design, one that would ironically be best exemplified in improved versions of Stoner’s previous work on the AR-15. But even modern versions of the AR still don’t offer what the Stoner 63 did back in the 1960s.

6. Colt RO635 Submachine Gun

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This weapon made a brief appearance during Operation Just Cause, the 1989 U.S. invasion of Panama to oust Manuel Noriega. Outwardly similar to the M16 family of rifles, the Colt RO635 uses a blowback operating mechanism rather than the direct gas-impingement system of its 5.56 mm brethren. Introduced in 1982 and chambered for the popular NATO standard handgun caliber of 9×19 mm, the RO635 accepts modified magazines similar to that of the Israeli Uzi submachine gun. Compared to the other submachine guns of the day, the RO635 is more accurate in full automatic fire due to its closed bolt design. The weapon was adopted in limited numbers by the Marine Corps in 1985, and members of the Marine Fleet Antiterrorism Security Team carried it during combat in Panama.

Despite its limited use, the RO635 proved that the AR-15 design could be adapted to other roles and calibers, taking advantage of the platform’s good ergonomics and easy-to-manipulate fire controls. It also foreshadowed the huge influence the AR-style rifle would have on future designs with both civilian and military weapons developing into alternative calibers and configurations while mimicking the same basic design elements of the original AR-15.

7. HK MK23 Mod 0 Handgun

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This German pistol was the product of the Offensive Handgun Weapon System, or OHWS, program. In the 1990s, Special Operations Command was keen to get all of its subordinates units using common small arms. Handguns were on the slate for improvement and the OHWS competition was launched in 1991. The competition specified a .45 Automatic Colt Pistol (ACP) caliber pistol capable of firing high pressure 185-grain “+P” rounds. A suppressor and laser aiming module were also to be provided, as the new pistol would be used as a primary weapon in certain special operations roles. German arms manufacturer Heckler & Koch won with its entry, which was adopted in 1996 as the Mark 23 Mod 0.

The Mark 23 certainly met all the the requirements of the OHWS program. It was reliable, having averaged around 6,000 rounds before a failure in testing. It boasted match-grade accuracy. The rail-mounting system for the laser-aiming module and light was innovative for the time.

But the Mark 23 was perhaps over engineered. The weapon was often derisively called the “world’s first crew-served handgun,” due to its large size when compared with other combat handguns of the era. The gun would become more iconic in the hands of movie and video game characters rather than special operators. While the Mark 23 may not have been the best fit for SOCOM, the trend of .45 ACP pistols continues; in 2011, SOCOM purchasedthe Heckler & Koch HK45 Compact to replace the Mark 23.

8. Close Quarters Battle Receiver Kit

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More conversion kit than standalone weapon system, the Close Quarters Battle Receiver is still an important step in the development of the M16 family of weapons. Designed to work with the M4 carbine lower receiver, the CQBR consists of an upper receiver assembly with a 10.3-inch barrel. This is about four inches shorter than the standard M4 barrel length, making for a compact weapon. Short barrels cause problems with the M16-style gas impingement systems, so modifications were made to the CQBR’s gas block to ensure reliable function. The assembly also featured the standard Knight’s Armament Company rail-attachment system. The CQBRwas designed by Naval Surface Warfare Center, Crane Division in order to fulfill a Naval Special Warfare requirement for a 5.56 mm weapon that could be maneuvered through the tight confines of ships being boarded and seized by SEAL teams.

The CQBR’s development marked a sea change in close-quarters weapons. By solving several of the teething issues that previous short-barreled M16 variants suffered, the CQBR led to the decline in popularity of submachine guns. Special operations units could now have a short carbine in the same size as a pistol-caliber submachine gun, all while firing the much more potent 5.56 mm round. The CQBR kit morphed into a full pre-built gun with the Mark 18, which remains in use with upgraded accessories from the Special Operations Peculiar Modification Block II program.

9. FN Herstal Mark 17

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This 7.62 mm rifle brings a Cold War concept into the 21st century. The Mark 17 comes from FN Herstal’s family of weapons that was selected by SOCOM as part of the Special Operations Forces Combat Assault Rifle program in 2004. The two primary elements of the SCAR family are the 5.56 mm SCAR-Light and the 7.62 mm SCAR-Heavy. Both were initially adopted by SOCOM for as the Mark 16 and Mark 17 respectively. But in 2010, SOCOMannounced it was cancelling orders of the Mark 16 in favor of the Mark 17.

The reason for this reversal was a matter of roles. The 5.56 mm Mark 16, while not a bad weapon by any stretch of the imagination, did not offer a dramatic difference in performance compared to the M4 carbine it was supposed to supplant. On the other hand, the Mark 17 brought an old concept into the modern age: the battle rifle. At the beginning of the Cold War, many infantry rifles still chambered full-power rifle ammo like the 7.62 x 51 mm round. These weapons were superseded by the development of intermediate caliber weapons like the M16. But once the United States found itself fighting in Afghanistan after 9/11, it was clear that 7.62 mm rifles were better suited to the extreme ranges found in theatre. Surplus M14 rifles were pressed back into service with some modern upgrades as a stopgap, but it wasn’t enough. The Mark 17 fulfills the battle rifle role with modern AR-style fire controls, a rail systems, and better ergonomics than the old M14.

The SCAR family continues development with SOCOM, as the Mark 17 has been upgraded to be a common receiver capable of switching between calibers. FN Herstal developed a modified version of the Mark 16 for the Marine Corps Infantry Automatic Rifle competition, but lost to Heckler & Koch’s entry. The weapon was also considered during the Army’s aborted Individual carbine competition that was looking to replace the M4 in service.

10. XM25 Punisher Airburst Launcher

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An advanced weapon, the XM25 rose from the ashes of a failed rifle program. It was originally designed as part of the XM29 Objective Individual Combat Weapon, an attempt to make a computerized assault rifle coupled with an 20 mm airburst grenade launcher. The program was canceled in 2005, but the airburst concept lived on. Enlarging to 25 mm grenade rounds, the XM25 Counter Defilade Target Engagement System began operational testing in 2010.

The bullupu-style XM25 feeds from a five-round magazine. It uses a laser rangefinder to determine when to detonate the round to engage the designated target. The airburst function makes it simple to engage target behind cover or inside structures. The XM25 earned a reputation for lethality in Afghanistan, with troops nicknaming it the “Punisher”.

After some delays due to safety malfunctions, the XM25 is now undergoing qualification trials with the Army. If all goes well, troops could be carrying one of the most advanced small arms ever designed as soon as 2017.

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