I don't know if it was a matter of being able to perfect the technique of forging one piece op rods, or just the fact that the other three makers made their op rods in the same method as the M1 Garand op rod. TRW being the latest producer, maybe thought it might be faster, or just stronger, thus better??? Just speculation on my part. You may very well be right. I know I read that some USGI flash hiders were cast, and some were forged. The forged ones were actually easier to make. You would think cast would be much easier... So manufacturing methods and techniques can and do improve.TRW was the only manufacturer who was able to perfect the technique of forging one piece op rods for their M-14's. The Chinese M-14/S clones also have one piece forged op rods.
They were made in the Republic of Korea and a very few were marked TRW that made it into the United States in early 2008. Statistically, unless you bought one marked TRW direct from the importer, I would not worry about it. Even at that, I know of at least one way to identify them but I don't want to share that information in a public forum. If you know as well, please don't post it. We have enough fake parts out there as it is. TIAWasn't there an outfit selling counterfeit TRW oprods that were produced overseas?
It's likely the Korean made M1A operating rod. However, the ad has a photograph of a M1 Garand operating rod: http://www.sportsmansguide.com/net/cb/cb.aspx?a=606371Anyone have info on those forged M1A oprods Sportsman's Guide is selling for $139?
I examined one last October. Here are my comments: http://ebrsopmods.proboards.com/index.cgi?board=dedicatedm14partsandmanuf&action=display&thread=2764Different, any comments on the quality on the thrustline op rods?
Very minor fitting was required to fit one to my SAI receiver. As a matter of fact, mine didn't pass the tilt test and I left it that way. I was reluctant to remove much material from the tab other than knocking down sharp edges with extra fine grit paper. I greased the tab and guide with PTFE grease and worked the rod back in forth in the action with the bolt and spring removed. I did this for about an hour while watching TV. And I've had zero cycling issues so far with this setup, everything works flawlessly and after 100 rounds or so she oughta be spot on perfect. My own opinion is that the tilt test poor advice, it need not fit that loosely. The original SAI passed the tilt test and would almost de-track on it's own, this is the reason why I changed the op rod in the first place.I examined one last October. Here are my comments: http://ebrsopmods.proboards.com/index.cgi?board=dedicatedm14partsandmanuf&action=display&thread=2764
The Thrustline Manufacturing operating rod will likely need fitting to your receiver but then most operating rods do if they are new. It looked good to me.