P Channel.
Bruce,
I do realise you asked what was the original material that went between the guards.
I believe MAC's have a reproduction of what we call P Channel.
I got some from the local rubber store in Wagga. But it is completely rubber and has no cord running through it. (The original bits I found when dismantling the F15 did have a rope/cord in them)
I can take a picture and post it here if it helps.
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Pax Vobiscum.......may you eat three meals a day & have regular bowel movements.
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