The Marco nocks in my experience have a little larger throat to them than the GT & CE large bore nocks, but they will still work on the same string if the string actually properly fits one or the other.
If the center serving properly fits the GT's, then the Marco's will be just a tad loose.
If the center serving properly fits the Marco's, then the GT's will be just a tad tight.
Either way won't be off enough to hurt anything.
Two strings works too. Makes stringers real happy.
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