https://www.acmearmi.com/products/equipment/ml37-picatinny-rails-for-extension-stock
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ML37 Picatinny Rails For Extension Stock
The Picatinny rails are intended to mount different kinds of sights.
Available
Details
The Picatinny rails are intended to mount different kinds of sights. For example: a red dot side on the top
The top rail has a 5 degree angle for direct shooting.