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had a dytac upper on a stock we m4 cqbr, theres something missing compared to the stock we upper...the dytac is missing a component to hold the inner barrel in place, so every time u pull the charging handle, the entire inner barrel with hopup willl be pulled back too...
thers a thread about modifying it to fit..i think it was on GGi...might have been asc tho
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