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The Zastava M59/66 PAP is a Yugoslavian licensed derivative of the Soviet SKS semi-automatic rifle.In Yugoslavia, it received the popular nickname "papovka" derived from PAP, the abbreviation for poluautomatska puška, or Serbo-Croatian for "semi-automatic rifle". [4]
The Stoner gas system of the American M16, M4, and AR-15 style rifles utilize a modified version of this where a gas tube delivers gas into the bolt carrier to impinge on the bolt, which acts as a piston to cycle the rifle. One principal advantage is that the moving parts are placed in-line with the bore axis meaning that sight picture is not ...
The gas tube and upper handguard could now be removed as needed to access the gas port and piston for cleaning. [2] The appearance of a 7.62×39mm prototype revived interest in Simonov's design, as only he and one other weapons designer, Alexey Sudayev , were able to produce rifles chambered for the new round on short notice. [ 17 ]
Threaded barrels are often mounted to the receiver with a lot of torque, and will therefore generally require tools for assembly and disassembly, such as a suitable action wrench and a vise. Depending on the firearm, a recoil lug is sometimes fitted between the barrel and stock as part of the process,
When the bolt and gas piston reach the rearmost position of the receiver, the recoil spring pushes them forward again picking up a new round and chambers it, and the cycle repeats when the trigger is pulled. [6] Another key feature cited in the reliability of the Saiga is that the rifle is designed to have loose tolerances between moving parts.
The gas operation is a system of operation mechanism used to provide energy to semi-automatic and fully automatic firearms. In gas-operation, a portion of high pressure gas from the cartridge being fired is tapped through a hole in the barrel and diverted to operate the action.
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"1. There is an elimination of the usual gas tubes, gas regulators, and the gas operated system in general. "2. There is a better balance and therefor a corresponding reduction in weight and size. "3. The mechanism fucntions with great reliability due to the vibrator's violent movement." Page 14, Column 1, Lines 21 - 33