Stoner AR Operating System Technical Detail
This is the first post in a new thread indicated by the title and post #29.
Please read all prior to commenting.
Thanks-
F2S
Quote:
Originally Posted by
tvfreakarms
What is it about the roller cam pins that don't really serve a purpose vs regular cam pins?
2 by 2...hands of blue
As far as I understand it, those rollers are supposed to prevent damage to the upper from the cam pin. I don't think they have any other purpose. And as we now know, those forged uppers last a very, very long time. So if the rollers are a liability, then it's really not worth having them.
What may be worth while, however, are the cam pins that are round instead of square. They don't have rollers; they're just round. I don't know if they would be any better than the square ones, but they might be worth looking into. They may reduce wear on the upper without sacrificing anything. I have no idea, I'm just saying that it's worth seeing where it goes. My gut tells me they're okay but probably don't offer much advantage over the square ones.
Stoner AR Operating System Technical Detail
Quote:
Originally Posted by
HansTheHobbit
No, I call it a magazine because that's the correct term. Look, I don't know where this idea came from that an AR isn't a DI gun, but it's wrong. If an AR isn't DI, then DI doesn't exist. And just because the bolt has gas rings doesn't make it a piston. The movement of the bolt is caused by the carrier, and then by direct blowback after it is unlocked. At no time does the bolt act as a piston. Again, a piston is a moving part, it's movement is directly caused by an expansion of gas, and it does work on other moving parts.
With the Hakim, you could argue that in some strangely philosophical way it's a piston gun. The gas key is functionally a very short long stroke piston. But anyone with a lick of common sense can see that it's really just part of the carrier, so it's a DI gun because there's nothing substantial that moves between the carrier and where the gas comes from.
Again, the definition of DI is any gun in which the gas is piped directly to the carrier without a piston in between. You can get all philosophical about what constitutes a piston if you want, but you can't get away from the definition of DI. Just out of morbid curiosity, what is your definition of DI???
You're wrong. You've been told why, in great detail, as to why you're wrong.
The has pushed the BCG back and that impacts the trigger. Just like the piston in an engine turns the crank shaft after the gas from the explosion pushes it down.
It's the same thing. Period.
Stoner AR Operating System Technical Detail
If you folks will remember, I didn't start this, and I'm not the one who just won't let it go. I very innocently asked a question about DI vs piston ARs, and a bunch of people started lecturing me about how ARs aren't DI. First of all, it's the accepted terminology that everyone understands. If I had referred to them as stationary piston vs conventional piston, NO ONE would have had a freaking clue what I was talking about. Quite frankly, I'm pretty pissed off. Everyone knew exactly what I was talking about, because it's the universally accepted terminology. Just because Armalite used the term stationary piston doesn't mean that the AR is a piston gun. That argument is absolutely absurd.
For the last time, someone give me their definition of direct impingement, in one sentence, or drop this altogether. There seem to be about ten of you DI reformists out there, yet not one of you can come up with a simple definition. Why is that?
Stoner AR Operating System Technical Detail
In recent times, the exact definition of the operating system found in AR-15/M16/M4 type platforms has come into question.
Paramount to this is what is exactly is the definition of "direct impingement" as detractors and enthusiasts alike refer to the patented Stoner system.
Reference the actual patent:
http://www.google.com/patents/US2951424
Key point of discussion:
Quote:
It is a principal object of this invention to utilize the basic parts of an automatic rifle mechanism such as the bolt and bolt carrier to perform a double function. This double function consists of the bolts primary function to lock the breach against the pressure of firing, and secondarily, to act as a stationary piston to actuate the automatic rifle mechanism. The primary function of the bolt carrier is to lock and unlock the bolt by rotating it and to carry it back and forth in the receiver. The secondary function of the bolt carrier is to act as a movable cylinder to actuate the automatic rifle mechanism. By having the bolt carrier act as a movable cylinder and the bolt act as a stationary piston, the need for a conventional gas cylinder, piston and actuating rod assembly is eliminated.
The preceding posts are in reference to this, though not necessarily in direct reference.
From here forward, the discussion beings.
As always, please be courteous and technical in the discussion.