Paul Smyth's exquisite volley had given Orient a 1-0 lead at the break following a dominant opening half from the league leaders.
But a triple substitution at the break brought about a much-improved second half display from Rovers and they hauled themselves level when Max Woltman’s pass found the run of Kyle Knoyle, who in turn crossed for Biggins to head home his first goal for the club.
Orient went closest to finding a winning goal but Omar Beckles headed onto the roof of the net.
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Orient went closest to finding a winning goal but Omar Beckles headed onto the roof of the net.