CYMA M3 Pump Action Shotgun

 

Table of Contents

 

1. Introduction
2. Description of Parts
   • External Parts
     • Housing Case (Left/Right)
       • Trigger
     • Stock/Handle
   • Internal

 

• Trigger Release & Springs
• Internal Firing Mechanism
  • Fore-End Attachment/ Chamber
  • Firing Cylinder

 

 

1. Introduction

 

The CYMA M3 Pump Action Shotgun is classified as a spring powered airsoft gun. It has a mostly durable plastic construction with an overall length of 36 inches and can fire a BB pellet up to 350 feet per second. The deadliness of firearms led to the development of airsoft guns, which simulates real guns minus the lethal factor while preserving the thrill of the sport. The idea of airsoft originated in Japan where a ban on real guns led to the development of airsoft guns because while firearms were illegal, model guns weren’t. And airsoft was to be classified as such. The idea that airsoft guns could be used to simulate combat quickly spread to other Asian countries, then soon afterwards to European countries and then to the rest of the world bringing about popularity to airsoft guns. (Airsoft History, 1)

 

2. Description of Parts

2.1 External Parts

 

2.1.1 Housing Case (Left/Right)

Figure 1 – Housing Case

 

2.1.2 Stock & Handle

 

The Stock and Handle represent one complete part but, are actually two parts internally combined. Assembled together they represent the rear of the Shotgun refer to Figure 1). The rearmost part of the stock, internally, contains sandbag counterweights weighing 3.125 pounds. This weight is to counter act the weight located in the front of the shotgun and is used to make the shotgun consumer friendly in terms of comfort and handling. The rear edge of the stock is slanted and forms a tapered oval shape with the width decreasing from top to bottom. The stock measures at a length of 5 inches and a maximum width of 1.5 inches. The Stock is designed in such a way to accommodate comfort as when the shotgun is being used, it is pressed against the armpit to also increase accuracy and handling. It measures 3.25 inches in length and 1.25 inches in width. The handle is designed with rounded edges to fit the user’s hand with the upmost comfort and has groves that measure 1/16 of an inch alternating being intruding and extruding to fit the users grip.  Both parts together are crucial for the use. With the design of the Stock and Handle it allows the user to have a grip equivalent to a mother holding her newborn child. A secure, firm, yet gentle grip.

 

Figure 2 – Stock and Handle

 

 

2.2 Internal Parts

2.2.1 Internal Firing Mechanism Assembly

 

The internal firing mechanism when fully assembled is 13.5” long. It is built with a black plastic durable enough to handle the force of the spring when firing the airsoft rifle. The mechanism sits on top of the receiver, behind the counterbalance tube and in the barrel. The main function of the mechanism is to confine the pellets to a more limit space to discharge accurately and with greatest possible force (see Figure-2).

 

Figure 3– Internal Firing Mechanism Assembly     

 

2.2.2.1 Fore-End Attachment & Chamber

 

The Fore-End Attachment and Chamber piece collectively weighs 1.0-oz (0.4-oz and 0.6-oz respectively). The chamber has an inner diameter of 3/4”, an outer diameter of 7/8”, and a length of 2”. The chamber then connects to a smaller hollow tube called the chamber pin, of inner diameter of 1/8”, an outer diameter of 3/16” and a length of 7/8”, which connects to the rubber O-ring and suction seal, which is attached to the internal barrel guide. The chamber is where the pellets are placed before firing. The Fore-End attachment takes the shape of half a cylinder measuring 15/16” in diameter and 5-1/16” in length. The Fore-End attachment is attached to the cylinder with a hinge held together by a stainless steel pin. On the far end of the Fore-End attachment, is a slot for the Fore-End to attach to allowing the pumping action to take place (see Figure-3).

 

2.2.3.2 Firing Cylinder

 

The firing cylinder weighs 0.5-oz and is made of a black plastic attached to a semi-translucent piece of rubber at the end, which acts as a suction to prevent air from escaping from the chamber piece. The plastic part is hollow, measures at 2-3/4” in length, 13/16” in outer diameter, and 11/16” in inner diameter. The rubber part measures 1/4” in length, 3/4” in diameter tapering outward to 7/8”. This piece is attached to the spring and when discharged, spring forward into the chamber thereby discharging the pellet (see Figure-4).

 

Figure 4- Firing Cylinder

 

 

Reference

 

Cyma M3 P799 FPS-350 Shotgun and P618 FPS-160 Pistol Spring Airsoft Guns Combo. (n.d.). Retrieved October 19, 2020, from http://www.hobbytron.com/SpringCYMAM3PumpActionShotgunP618PistolComboAirsoftGuns.html

Airsoft History and Its Background: Where did Air Soft Come From? (n.d.). Retrieved October 19, 2020, from http://www.airsoft-guns-gas-electric-spring.com/airsoft-history-background-of-air-soft-guns.html