What happens when you use a gas cylinder? The gas cylinder holds the tip end of the rod in the proper position and the tab holds the rear end. Also, when you have a new rod with a new tip and a new gas cylinder there is very little clearance between the rod tip and the cylinder. If everthing is not just right, the tip can bind in the cylinder.
The problem is the exact same whether I have a gas cylinder installed or not. The op-rod does not bind on the cylinder in any way. I tried it without the cylinder installed to assure that it was not a cylinder problem. The op-rod still binds in the same place with the same force regardless if a cylinder is installed or not.
Thanks,
Brett
If the rod binds without the cylinder on then it must be the op. rod tab binding in the slot.
I can't help myself....is the trigger group latched in when you are having the bind? Sorry, I just had to ask.
move along, nothing to see here
Dan
Just an ignorant thought to throw out here but is there any chance the receiver has a distortion or twist between the front and back? That could explain the binding and the strange pop putting that second trigger group in (at least in my mind that is) :)
Good luck
Dan
DD,
No trigger group. Just a barrel, receiver, op-rod and too much friction.
Dan,
Some type of odd receiver problem is all I can think of and I'm at a loss to try and figure it out anymore. I'm going to send it off to a smith.
Thanks for the help everyone.
Brett
Brett
So as I understand it the receiver guide stud is binding in the receiver track
this occurs at the front of the receiver?
A op-rod will travel farther forward without a bolt installed
so the binding may be a result the op-rod running forward of its normal stop position with out the bolt
see if the friction is the same with a bolt installed
also dyechem can be used to indicate the interference
****M LAYOUT FLUID at Brownells
Mark,
The friction is when the op rod is in its last half inch of travel to the REAR. There is no friction/binding previous to this. Friction is the same with or without a bolt installed.
I don't know if all the binding is coming from the receiver guide stud. I do know the op-rod saddle/bottom of the barrel are binding, the bottom of the op rod handle at the forward part of the receiver is binding and I think the third point comes from the op rod tab.
It is like the barrel is tilted down: This causes the saddle to hit the barrel, the tab to ride high the the channel and the bottom of the op rod handle/forward edge of receiver to be the fulcrum/pivot point.
I think Dan is correct-the problem seems to have been narrowed down to the rec'r. You say you used a breaker bar and a great deal of torque. I'm wondering if the rec'r wrench may have been twisting on the rails!
Have you re-checked the barrel index using a bubble level rather than your indexing fixture? Also try a couple different gas cylinders when using the bubble level.