paladin2019 wrote:Raygun wrote:paladin2019 wrote:*let's stop using the incorrect "direct gas impingement" label, please
Oooookay. If you could enlighten me as to the incorrectness of it, I would appreciate it.
It doesn't exist in any armorer's manual until after 2000?
Sooooo... They've called it 'direct impingement' since 2000, but that doesn't count for some reason?
(Coincidentally, I don't recall AR-15 pistons systems widely marketed as the next big thing prior to this, either.)
The earliest references to the language I can personally find are in the book
Military Small Arms of the 20th Century, 6th Edition, by Ian Hogg and John Weeks (1991). With regard to the M16 family of rifles, page 179 states "It operates on
direct gas impingement on the bolt carrier," and regarding the AG42 Ljungman rifle on page 169, it states "...the usual gas piston assembly was dispensed with in favor of a simple
direct gas system in which gas tapped from the barrel is allowed to strike the bolt," and regarding the French MAS-49 rifle on page 145: "The gas system uses no piston or cylinder, the gas being piped back to
impinge directly on the face of the bolt and blow it backwards."
I'll look at Stoner's (2951424) and Eklund's (2388396) patents and see if there's any precident for the wording. I'm not sure that it's there, but it's a possibility that the creators may have had something to do with it.
What one should notice about all of the patents and rifles in question, regardless of the language, is that none of the weapons include a component of the operating system which all other gas-operated systems possess, and that is a 'connecting rod' or 'operating rod'. There is no indirect, intermediate device for propellant gasses to act upon and transfer motion to the bolt group. In the case of the system in question, gasses come into contact with, expand against, impinge upon the bolt group directly, inside a chamber between the piston (in this case, the bolt, with the piston rings on it), and the cylinder (bolt carrier, which surrounds the piston), causing the cylinder to be forced rearward.
The combat developer (ie, the DOD) describes this system as gas operated while contemporary systems as gas piston operated in 1960?
If only now we could call them something that might more quickly and easily differentiate the two... Hmm. *finger to lip, brow arched*
It certainly makes sense that the term would come into more use when competing methods of gas operation were being tested on the same platform. Both of them are forms of gas operation, can we agree on that? And can we agree that it's handy to be able to easily differentiate between the two?
The specification for the M16 and M4 rifles is a "lightweight, gas-operated, air-cooled, magazine-fed, shoulder-fired weapon that can be fired either in automatic three-round bursts or semiautomatic single shots"?
And if only the Combat Developer's words were as those of God Himself! *thunderclap*
"Book of Armaments, Chapter 11, Verse 27: Lo, and it was the AR-10, and it was a pretty good idea, but needed some work. And the Lord said unto Eugene, "Nay! Its method of operation shall not be referred to as 'direct impingement'! At least not until the Combat Developer approves of such language in armorer's manual form around the year of 2000. And even then, thou shalt be suspicious of such language!"
Amen.
Okay, FINE. I won't call it 'direct impingement' anymore, so as not to upset your delicate military sensibilities.
It's all about crystal meth and Gwar. - Hauze