Quoted: Since we are discussing M-14 Rifles, exactly what is a NM Op Rod? I have seen them for the M-1 Rifle (and marked as such), but I haven't yet seen one for the M-14.
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There's only 1 way to explain that one.I'll give it a try here.
On some new M14 op-rods,the receiver lug near the handle may be a bit over size by as little as .002-.003 Also known as hand picked and gauged.
These op-rods were used on M14 match rifles because they could be fitted to a paticular receiver.By fitting to the receiver the op-rod would be a tighter fit eliminating vibration and as much free play as possible.
The receiver lug would be taller and on some a hair thicker.Some were so tight after being fitted that you would have to pry them off the receiver if thay were dissassembled.
M14 NM op-rods were never marked like the M1 Garands.If you look around for a good M14 op-rod,you can sometimes still find one that would be a tight fit.I have 4 SAK and 3 TRW M14 op-rods that meet those requirements and I've sold new op-rods that customers said they couldn't get on the receiver.
HTH