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Lonny R. asked 7 years ago:
Lonny, Round shape on end cap. 13" quad rail will be too long for the carbine length gas block on the A2 front sight. If it has A2 cut out or have to go with 7" or 8" quad rail.
Michael W.
7 years ago
Lonny, it is "Round" as demoed in this removal video at 3:30 ---- https://www.youtube.com/watch?v=o50V6T8Zwwc
James G.
7 years ago
