Side-charger gas-key slot plug?

danieljay

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Full Member
Minuteman
Jan 27, 2009
6
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42
Western Wisconsin
I have a AR-15 upper which has both side and top-charging handles. I never use the top-charge, and want to find a plug that would replace the top-charging handle. Has anyone ever seen something in this vein?

It has to be something easily removable, so that I can remove the bolt carrier for cleaning. I've thought about modifying the lower receiver to cover the slot, but would rather have a solution that wouldn't require modification.