the sector gear is not parked correctly vs the piston.... did you remember to release the spring tension by using the forward assist before you split the upper and lower? hit the forward assist now, split the upper and lower and ensure all the sector teeth are facing down and not up and remarry the receivers and try again.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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