View Full Version : Why are most Semi Auto's Recoil Operated ?

18-05-2009, 05:28 PM
Why most semi-autos are recoil operated?

18-05-2009, 06:37 PM
Recoil operated is a very reliable method of operating. I think thats one of the major reasons.

Abu Al Hawl
18-05-2009, 07:19 PM

Recoilng is for hand guns and gas is for auto rifles, its a lenghty topic to discuss. DE is size of a canon so it woks on DE but can not work on compact size weapons.

19-05-2009, 07:14 AM

19-05-2009, 08:00 AM
Recoil operated is a very reliable method of operating. I think thats one of the major reasons.
Assualt rifles and machine guns have heavy recoils, than why they are gas operated.

19-05-2009, 01:19 PM
P7 M8 & M13 Gas operated
P7 is not gas operated,its recoil operated and gas retarded.

19-05-2009, 03:01 PM
Hamid bro some assault rifles are partially recoil operated like the G3 family is delayed blowback operated.

Conceal Carry
19-05-2009, 11:41 PM
Recoil is nothing but Newton's third law of motion. The idea of Semiautos was conceived to utilize the reverse motion of the gun to 1- automatically cycle the slide to feed a new round in the chamber and 2- to reduce the recoil by channeling that energy to move the slide back and cycle a new round. All handguns, SMG's and machine guns are recoil operated. How that recoil is used, is what we call innovation and development.

Makarov is a simple blow back gun. The energy of the blast in the form of expanding gases pushes the bullet out of barrel and at the same time forces the slide to cycle backwards to feed anew round, the only thing resisting the backward movement of the slide is the recoil spring. If the recoil spring weakens beyond acertain limit the slide willbreakout of the frame and hit your face, hence it is very important to replace your weak recoil spring on time.

9mm Para on the other hand can not be fired from a simple blow back design, becasue it is a much more powerful round and some form of resistance in addition to the spring is required to slow/ delay the slide cycle. this is achieved by various different designs which include Delayed blow back, delayed roller blck , rotating bolt, rotating barrel, tilting barrel, and gas piston system etc.

All these methods use the blast energy for the rearward movement of the slide but use mechanical means to either slow it down or dealy it till the gas pressure drops to a safe level enough to cycle the slide. Gas piston also uses the same blast energy which pushes a piston backwards in to a built in cyclender which because of compressed air in the cyclender.

Gas/ piston system is mostly used in SMG's and full auto weapons because it is more reliable (based on natural phenomnon, compression of gas) then with mechanical system which depends on metal parts. As the auto weapons are subjected to more working pressures at higher frequency, chances of mechanical part failure becomes higher thus gas piston system becomes more reliable and easy to maintain.

Handguns on the other hand are not subjected to high frequency rapid fire, thus the mechanical system performs reliably.

20-05-2009, 11:18 AM
@CC thanks for the info bro, I got my answer.

21-05-2009, 06:00 PM
What is gas operated? PLZ explain

21-05-2009, 06:14 PM
@Ateeq1... Bro if you are interested in getting an answer to your post, plz go through the post at Serial no 8 above,
posted by Conceal Carry. To further quench the thirst for more knowledge on the topic, try another thread titled "Gas
Operated Vs Recoil Operated Shotguns" by Bluff, in the Shotguns and Rifles section of the forum.