BEC Double Stack

Season 4 Art GIF by Parks and Recreation
looks like an edge break or chamfer on the rear of the frame rail.
The chamfer should run the whole way on top & bottom on frame rails.

My supplier chamfers the 2011 rails More aggressively compared to the
single stacks.

Sometime you have to re-chamfer depending on how much rail material needs to be removed when fitting the slide.
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