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The RPD fires from an open bolt in full auto only. There is no provision for semi-auto fire, although RPD gunners were trained to fire in short bursts to prolong the life of the non-quick-change barrels. The RPD feeds ammunition from the left side using a metallic, open-link, non-disintegrating belt typically holding 100 rounds of 7.62x39 ...
It is a belt-fed, open bolt, fully automatic light machine gun with a rotating bolt and a long-stroke gas piston. [1] The RPL-20 uses a non-disintegrating linked belt similar to the RPD. Alternative designs experimented with a dual-feed option (i.e., capable of both magazine- and belt-feed), considered to be an improvement over the RPK-74.
The Stoner 63/63A is chambered for the now-standard 5.56×45mm intermediate rifle cartridge. When in the belt-fed role, the weapon would feed from a disintegrating metallic linked belt marked "S-63 BRW" which is a scaled-down version of the U.S. M13 link developed for the M60 GPMG. The Stoner 63/63A will not work reliably with the later M27 ...
Many modern ammunition belts use disintegrating links. Disintegrating links retain a single round and are articulated with the round ahead of it in the belt. When the round ahead is stripped from the belt and fed into the feed system or chamber, the link holding it is ejected and the link holding the following round is disarticulated.
[1] [2] He designed a belt-fed light machine gun, the RPD, chambered for the 7.62×39mm intermediate cartridge. [2] Vasily Degtyaryov was awarded the Stalin Prize in 1941, 1942, 1944, and 1949 (posthumously). [1] He died on January 16th of 1949 and was later buried in a cemetery in Kovrov. [1]
Like the M13 link, the M27 link is a push-through design. Rounds are extracted by pushing forward out of the link. With the round freed, the link disintegrates (detaches from the belt) and is ejected. This is in contrast with older belt systems which were typically made of fabric and were fed straight through the weapon without disintegrating.
The M13 link replaced the older M1 links designed for .30-06 Springfield ammunition, which bound cartridges to each other at the neck, used on the older M1917 Browning machine gun and M1919 Browning machine gun family, though some conversions of the M1919 to the M13 were done, such as on the U.S. Navy Mark 21 Mod 0 machine gun, which saw service in the Vietnam War.
The SKS and RPD were dropped as being less effective than hoped. The RPK, with its magazine and parts commonality with the base AK-47, was more effective. It replaced the RPD as soon as manufacturing techniques allowed it to be mass-produced. RPK; RPKS: A version with a side-folding wooden stock (S for -skladnoi).