CS/LS06 “Chang Feng” Submachine Gun

By N.R. Jenzen-Jones

The Chang Feng submachine gun (SMG)—known in its latest iteration as the “CS/LS06”—is in service with Chinese law enforcement and paramilitary personnel, as well as specialised units from other nations. The design is notable for its 50-round helical magazine and is often issued with a suppressor. Development of the Chang Feng SMG began in the mid-1990s by the Chongqing Changfeng Machine Company Ltd., based in the southwestern Chinese city of Chongqing.

The weapon was conceived by veteran designer Qing Shangsheng, under the auspices of the Changfeng Military Products Research Institute. In addition to leading the design team for the QSZ-92 pistol, Mr. Qing had previously worked on a number of other small arms projects, including the Type 64 7.62×17mm pistol, Type 67 7.62×17mm suppressed pistol, Type 80 7.62×25mm submachine gun, Type 56-2 self-loading rifle, both 7.62 and 5.45 light machine guns (“squad automatic weapons”), and a variety of sporting pistols, a signal pistol and even a derringer. Prior to working on the CF05, he had already secured a patent for a high-capacity quad-stack, double-feed magazine for the Type 56-2.

Prototypes

According to a 2006 interview with the designer, he initially developed the concept in secrecy between 1993 and 1994 and did not share it with the factory manager until 1996. Four main series of prototypes were then developed. The first prototype used the weapon’s helical magazine to form part of the buttstock, fitted with a removable rubber butt pad. Versions of Prototype I were developed with different burst functions: Prototype I-1 had a two-round burst mechanism, and Prototype I-2 had a three-round burst mechanism. The second prototype’s magazine moved so that it sat above the barrel and introduced the closed-bolt, blow-back operation.

Prototype II was fitted with a telescoping stock. Both Prototypes I and II were chambered for 5.8×21mm.

It was determined that export sales were to be a priority for this weapon, and the weapons were updated to chamber the internationally popular 9×19mm cartridge. At this point, the program adopted the designation “QC-9” for the guns. As well as the new chambering, Prototype III saw experimentation with under-folding buttstock designs. Prototypes III-1 and III-2 have slightly different folding stock configurations. Prototype III-2 also introduced an optics mounting capability.

Prototypes I, II and III were all able to feed from a secondary feed device—a detachable box magazine housed in the pistol grip of the gun. These were QSZ-92 pistol magazines, which are produced in both 5.8×21mm and 9×19mm versions. A separate magazine release, located on the pistol grip, is visible in the first three prototype series. In the first prototype, it was possible to inadvertently introduce a feeding issue with both magazines fully seated. In Prototypes II and III, the box magazine could not be fully seated until all rounds were fired from the helical magazine, tripping a switch.

By Prototype IV, the design had returned to using a telescoping buttstock, and the alternate box magazine feed system was removed. A magazine release button is still seen on the pistol grip of all prototype weapons. In Prototypes II and III, the forward and rear pistol grips are connected via a bridging structure. Prototype IV-1 also has this “bridged” configuration; however, by Prototype IV-2, the furniture design is essentially finalised and is close to the production gun. The prototypes had a cleaning kit stored in the front pistol grip, which was also dropped from production guns. By the last prototypes, the translucent brown helical magazines appear to have been introduced, and translucent white magazines followed in early production guns.

A number of further changes were made as the QC-9 progressed through development. The weapon underwent trials in 2004, and issues with extractor strength, feeding issues, trigger issues, and the fire selector were resolved. The weapon was finally approved for serial production in May 2005. The production version of the weapon, now designated the CF05, was publicly showcased at the first annual China International Exhibition on Police Equipment and Anti-Terrorism Technology and Equipment (CIPATE) on May 10, 2005.

Export Variant

In 2006, the export variant of the weapon was approved, and the designation CS/LS06 was applied. Export versions of the weapon have occasionally been marketed as the Type 06, but CS/LS06 remains the most common name. “CS” likely stands for “China South,” as in “China South Industries Group,” which included Changfeng amongst its subsidiaries. This designation is seen on the title page of an English-language SMG manual from the mid-2000s (China South Industries Corporation’s “Operation & Maintenance Manual of 9mm Light Submachine Gun Type CS/LS06,” state-owned document #236), which was intended for the export version of the gun. It has been suggested by several observers that “CS06” is the designation for the firearm, whilst “LS06” is the designation for the suppressor. Not only is there no evidence to support this claim, “CS/LS” designations are applied to other export submachine guns without suppressors. The Changfeng Machine Company merged with Jian She several years ago, and so the “CF05” designation is unlikely to be used again.

The Chang Feng design is a hammer-fired, blow-back operated submachine gun chambered for 9×19mm, firing from a closed bolt and feeding from a 50-round helical magazine. The design uses a telescoped bolt which wraps around the barrel when in battery. At the end of its rearward travel, the bolt is stopped against the rear of the barrel assembly, rather than the receiver. The polymer receiver features a collapsible stock, and the barrel is threaded to accept a suppressor, which is typically supplied with the gun.

CS/LS06 Features

The CS/LS06 features a combined fire selector/safety, which allows for safe (B), semiautomatic (D) and automatic (L) modes to be selected. The selector can be removed like a “key” to the gun, locking it in the safe position. A three-position aperture sight is marked for 50m (“5”), 100m (“10”) and 150m (“15”) engagement ranges. The stock is extended from the collapsed position simply by pulling it rearward. It is collapsed by pressing in the buttstock latch on the left-hand side of the weapon. Detailed disassembly is quite complex, but a basic field strip can be conducted relatively quickly without tools.

The most notable feature of this weapon is its 50-round helical magazine. Helical magazines, often confused with drum magazines, use a staggered-helix design, which allows for a substantial increase in carrying capacity in a relatively compact form-factor. This results in a cylindrical magazine, which is often (as in this case) mounted above the weapon’s receiver, rather than below it.

Whilst helical magazines have been repeatedly tested in western countries (one early example of an internal helical magazine can be seen in the Evans Repeating Rifle, patented in the late 1860s, for example), they have typically found more favour in China, Russia and their client states. Perhaps the magazines of this type, with which most western readers will be familiar, are those used with the American Calico series of firearms. In fact, Qing expressly stated that the CF05 helical magazine design was influenced by a research trip a colleague took to the United States, where this person observed the Calico designs. Nonetheless, the construction of the magazine is closer to the Russian PP-19 Bizon submachine gun type.

Their inherently complex design makes helical magazines more prone to failure. The Chang Feng SMG manual gives a “failure rate” for the weapon of “equal to or less than 3 ‰,”  or three failures in every 1,000 rounds fired (1 in 334, or thereabouts). This failure rate would be considered unacceptably high by modern western standards, even under the assumption that this probably refers to all stoppages rather than just parts “failures.”

Reloading the magazine is a much more complex operation than that for conventional detachable box magazines. According to the gun manual:

5.2 Cartridge loading: Load required cartridge from loading port of cylinder (as shown in fig. 26, never miss loading), then apply spring force clockwise (as shown in fig. 27). Each turn of cylinder could contain 8 rounds and 50 rounds at maximum. Turns of spring force required is decided according to loading rounds. Turns of applying spring force equals to (X+1;n—rounds of loading cartridge [sic] …

That wording will likely be opaque to most readers, but thankfully the manual also includes a table which makes the process comparatively straightforward. Paraphrased, it indicates:

Table 1

Whilst the export weapons have almost exclusively been seen with opaque black polymer magazines, the manual notes “This gun is equipped with black opaque cylinder; if cartridge indication is required, brown semi-transparent cylinder could be equipped.” The weapon is typically offered for export with Chinese-made accessories, including a laser/light module (LLM; the most common appears to be the LLR-2), optical day sight, grenade launcher and suppressor.

The latest model of the gun features HK-style red and white pictographic safety/selector markings, new furniture textures, a forward-canted front pistol grip and trigger guard, a modified stock design and the model name moulded into the plastic on the left-hand side of the weapon.

The suppressor attaches via a left-hand metric thread on the barrel, located behind the muzzle device. A retaining/indexing pin is located below the muzzle. The SMG manual recommends disassembly and servicing of the suppressor after 150 rounds have been fired. Some limited suppressor testing was undertaken by Dr. Philip H. Dater and Dan Shea, the results of which were published in the Small Arms Defense Journal, “Chinese CS06 LSMG and LS06 Suppressor,” Vol. 3, No. 4.

In Service

The Chang Feng submachine gun has been documented in service with Chinese police and paramilitary forces. It is used by the elite No. 1 Detachment of the Beijing Special Weapons and Tactics Unit, known as the Blue Sword Commando Unit. Other police units around the country have also used the weapon, and it has been documented in a number of high-profile police actions, including protection of the Beijing Olympics and a hostage rescue action in Changchun, the capital of China’s northeast Jilin Province.

The weapon is also issued to components of the People’s Armed Police, including 3rd Group, 13th Detachment of the Beijing General Corps, known as the Snow Leopard Commando Unit. Snow Leopard personnel were observed carrying the weapon during training prior to the Beijing Olympics and in the Sino-Russian “Peace-Mission 2007” joint military exercise. In recent years, Chinese security forces are believed to be moving away from the Chang Feng design and toward new designs which are supposedly capable of firing a broad range of 9×19mm ammunition, from less-lethal to +P+ loads. Nonetheless, those that remain in arsenals are likely to continue to be seen.

A number of export sales have also taken place, with confirmed transfers to Myanmar (Burma), Venezuela and Uganda. In Venezuela, the weapon is used in a close personal protection role by the 509 Special Forces Battalion of the Army, Presidential Honor Guard personnel and members of the Special Unit for Security and Protection of State Personalities (UESPPE).

TECHNICAL SPECIFICATIONS

Calibre: 9×19mm

Overall Length (buttstock collapsed): 412mm (w/out suppressor); 631mm (w/suppressor)

Overall Length (buttstock extended): 595mm (w/out suppressor); 814mm (w/suppressor)

Barrel Length: 232mm

Weight: 2.2kg (empty w/magazine); 2.9kg (loaded with 50-round magazine)

Sight Radius: 285mm

Rate of Fire: 800 rds/min

Feed Device: 50-round detachable helical magazine

V0: 360 m/s

SOURCES

 ARES CONMAT Database.

China South Industries Corporation, “Operation & Maintenance Manual of 9mm Light Submachine Gun Type CS/LS06,” State-owned document #236. [No date.]

FirearmsWorld. “CS/LS06” 2012. firearmsworld.net/china/smg/cf05/lwsmg.htm.

NORINCO, Small Arms. Sales catalogue. 2012.

Pérez, Pedro, “Chinese ‘Chang Feng’ Submachine Gun in Venezuela.” The Hoplite Magazine. August 19, 2019. armamentresearch.com/chinese-chang-feng-submachine-gun-in-venezuela.

Special thanks to Ellie Chang, Pedro Pérez, Maxim Popenker and Timothy G. Yan.

This article is reproduced courtesy of Armament Research Services (ARES). See www.armamentresearch.com for further original content.

The Chinese are keeping what they consider the best to themselves – their basic weapon systems in the 5.8mm cartridge types.  The Type 05 submachine gun in the 5.8x21mm indigenous caliber is not for export.  This bullpup style polymer based open bolt submachine gun with its integrated but detachable suppressor is accurate, robust, and well thought out.  The export version is called the “JS” submachine gun, and it is in 9x19m.  There are other submachine guns made in China at present.  The Type 85 is an advance on the old Type 64 design with its proprietary 7.62mm cartridge, and the Chang Feng series of submachine guns are active for export and police use.

Chang Feng-designed late model CS06/LS06 submachine gun with suppressor.

The original CS06 submachine gun came from the Chang Feng manufacturing company in China and it was designed with its helical magazine to feed the 5.8x21mm cartridge, but could also use the magazine from the Chang Feng made pistol, the QSZ-92. This feature was dropped on the production model.

During a trip through Southwest Asia, we uncovered a cache of Chinese weapons and were able to disassemble, analyze a bit, and test the CS06 and its suppressor.  We are uncertain of the nomenclature: popular gun lore suggests the LS06 is the suppressor, the Chinese call this the CS06/LS06 model, but we do not know for certain.  The suppressor was an elaborate and overcomplicated design, expensive to machine, and it performed poorly.  Dr. Dater’s initial analysis of how ineffective the design would be was born out in testing.  Lack of time kept us from doing a complete armorer’s photo shoot and video.

Overall, the CS06 was an effective submachine gun platform.  Disassembly was difficult and a bit complex, not near as troubling as reassembly – until we found a manual and discovered the secret in the rear pin system.

The CS06 submachine gun barrel has rows of angled ports that aim gas into the rear entry chamber of the suppressor. Mounting the suppressor is using the lock ring of the can onto the left-hand, standard metric threads.

CS06 Specifications

Caliber:  9x19mm
Length:  591.5mm buttstock extended, 408.5mm buttstock retracted
Weight:  2.3 kg
Mag. capacity:  50 round Helical drum
Rate of fire:  not measured – reported to be 750-850 RPM
Life cycle:  8,000 rounds
Manufacturer:  PolyTechnologies (www.polyinc.com)

Raw sound test results taken on various sound suppressors 
Dr. Philip H. Dater & Dan Shea.

Temp:  83.5/29(F/C)
Humidity:  37.2%
Barometric Pressure:  675(mmHg)
Velocity of Sound:  1,143 ft/sec.
Protocol:  Mil-Std-1474D
Meter:  Larson-Davis 800B
Microphone: Larson-Davis 2530, 1/4 inch Random Incidence
Calibrator:  Larson-Davis CA250 N.I.S.T. traceable calibration and certification

Chinese manufactured (Polytechnologies offers this) CS06/LS06 submachine gun with suppressor above it. Note the 50-round helical drum to contain the 9x19mm ammunition. Charging handle is on the right. The bolt system telescopes around the barrel to shorten the action. A short Picatinny style rail is under the front of the barrel area.

Chinese SMG CS06 or LS06 (Chang Feng family), detachable suppressor, Baseline with no suppressor:

Weapon & Ammunition: CS06 / LS06  9x19mm
Suppressor:  NONE
Weighting:  A
Average of 3 samples:  157.2 dB
1st Round Pop:  -0.3 dB
Average remaining 2 rounds: 157.3 dB (157.0, 157.3, 157.3)
Standard Deviation:  0.14

Chinese SMG CS06/ LS06 (Chang Feng family), suppressor installed:

Weapon & Ammunition: CS06/ LS06  9x19mm
Suppressor:  CS06/ LS06
Weighting:  A
Average of 5 samples:  135.5   dB
Reduction:  21.7
1st Round Pop:  +1.6 dB
Average remaining 4 rounds: 135.2 dB (136.8, 135.0, 136.3, 134.3, 135.3)
Standard Deviation:  0.90