| Ciężki karabin maszynowy wz. 30 | |
|---|---|
 heavy machine gun wz. 30 on tripod wz. 30 | |
| Type | Heavy machine gun |
| Place of origin | Second Polish Republic |
| Service history | |
| In service | 1931–1970 |
| Used by | SeeUsers |
| Wars | Spanish Civil War World War II |
| Production history | |
| Designed | 1930 |
| Manufacturer | Państwowa Fabryka Karabinów |
| Produced | 1931–1939 |
| No. built | 10,388+[1] |
| Variants | wz.1930a wz.1930/39T (cal. 7.65×53mm, prototype for Turkish army) wz.33,wz.36 (aircraft guns) |
| Specifications | |
| Mass |
|
| Length | 1,200 mm (47 in) |
| Barrel length | 720 mm (28 in) |
| Cartridge | 7.92×57mm |
| Caliber | 7.92 mm |
| Action | recoil |
| Rate of fire | 600 round/min |
| Muzzle velocity | 845 m/s (2,770 ft/s) |
| Feed system | 330-round belt |
Ckm wz. 30 (short forciężki karabin maszynowy wz. 30; "heavy machine gun 1930 Pattern") is a Polish-made clone of the AmericanBrowning M1917heavy machine gun. Produced with various modifications such as greater caliber, longerbarrel and adjustablesighting device,[2] it was an improved although unlicensed copy of its predecessor, and was the standard machine gun of thePolish Army from 1931.[3]
AfterPoland regained her independence in 1918, her armed forces were armed with a variety of different weapons, mostly a legacy of the armies of her former occupying powers. As with its rifles and carbines, themachine guns used by thePolish Army in thePolish–Soviet War included the Russian 7.62 mmM1910 Maxim, the Austrian 1907 8 mmSchwarzlose MG M.07/12, the German 7.92 mmMaschinengewehr 08, and the French 8 mmHotchkiss Mle 1914. Such diversity was a logistical nightmare, and in the early 1920s the General Staff of thePolish Army decided to replace all older machine guns with a new design, specifically built to Polish designations.[2][4][5]
Initially the Hotchkiss machine gun, proven during the Polish–Soviet War and adapted to the standard Polish 7.92 mm round (as theCkm wz. 25 Hotchkiss), had the most supporters. In late 1924 and early 1925, 1,250 were ordered from France and the Polish Ministry of War started talks on buying the license for manufacturing copies in Poland. However, the first tests of the post-war Hotchkiss machine guns proved that the new production were well below both Polish needs and maker's specifications, and the talks came to a halt. By the end of 1927, the ministry organized a contest for a new standard all-purpose heavy machine gun.[2][4][5]
Four companies took part in the competition: the AmericanColt company with the M1928 (modified export variant of theBrowning M1917A1), aCzechoslovak-built rechambered version of Schwarzlose M.7/12 (Schwarzlose-Janeček vz.7/24), the BritishVickers machine gun converted to 7.92mm caliber, and Hotchkiss with improved wz.25 model.[3] All initial tests were won by Browning. The tests were repeated in 1928, and again the American weapon won, so the Polish ministry decided to purchase a license. The price, however, was very high ($450,000), and Colt demanded an order for 3,000 guns in its own factories.[3] It turned out that neither the Colt company nor its European representative, the Vickers-Armstrong, had patented the design in Poland. In addition, the documentation of a recently purchased license forBrowning Automatic Rifle (via Colt's agent, Belgian companyFabrique Nationale de Herstal) was faulty, and deliveries were delayed, which discouraged the Polish from further orders abroad. Because of that, the Polish ministry decided to order the preparation of a local version of the Browning M1917 atFabryka Karabinow ("Rifle Factory") in Warsaw.[3]
In mid-1930 the first test models were ready and were sent to various testing ranges. In March 1931 the first 200 models were sent to front-line units for further tests under the designation of Ckm wz.30.[3] Serial production started by the end of that year. Among the most notable differences between the original and the Polish clone were:
Three types of a tripod mounting were developed and used in Poland. First was wz.30 mounting for infantry (weight 29.3 kg), superseded with improved wz.34 mounting (26.3 kg). Cavalry adopted more modern wz.36 mounting instead (17 kg). All tripods could be used for anti-aircraft fire, using a mast, transported in a rear leg in case of infantry mountings, or folded below the barrel and fulfilling also a role of a recoil shock absorber, in case of the cavalry mounting.[3]
Following the first tests, a series of additional modifications was introduced. In 1938 thetrigger mechanism was replaced with a completely new, more reliable system. In addition, the lock was replaced for easier handling and keeping the weapon in good condition. The modified design received the designation ofckm wz.30a, though the name was rarely used by the soldiers themselves. The new version was also the basis of ackm wz.30/39T design, designed for export to Turkey and adapted to Turkish standard7.65×53mm Argentine ammunition. However, the design was never introduced in large numbers as the Turkish competition was halted afterWorld War II broke out. In the late 30s, Wilniewczyc and Skrzypinski designed experimental barrels with a rifled oval barrel bore ("Lancaster rifling"). The barrels were very expensive to produce, but gave a significant increase of the accuracy and longevity of the barrel. Altogether, between 1931 and 1939, theFabryka Karabinow ("Rifle Factory") in Warsaw built at least 8,401 ckm wz.30 for the Polish Army, in addition to 200 of information series (available are only data until March 1939, and several hundreds more were probably built by September 1939).[3] In addition, quite a big number - over 1,700 - wasexported by theSEPEWE syndicate toRepublican Spain.[3] There were trials to sell them also to other countries, likeRomania, Bulgaria, Estonia, Yugoslavia and Argentina, but in spite of favourable participation in contests, the state factory had no resources to credit deliveries.[3] Among others, in 1936 in Argentina the wz.30 machine gun was evaluated as more reliable and accurate than original Browning M1928, but Colt could ensure more favourable conditions of delivery.[3] In 1938 Turkey ordered 500 wz.30/39T machine guns and probably at least part of this contract was fulfilled.[3] Captured weapons were used byNationalist Spain, Nazi Germany and Romania. After 1939, many preserved wz.30 machine guns were used by Polish partisan units (mainlyHome Army), among others duringWarsaw Uprising.
Second Polish Republic
Kingdom of Romania
Second Spanish Republic
Nationalist Spain
Turkey
Nazi Germany
Republic of China:Supplied in small quantities by the Soviet Union in 1940
