Seems study like it will hold zero. Too bad it won't fit in anything because the relief is too tight. Would have to ground material down to get it on any rail. 10/22, AK ultimak, pistol, shotgun trip rail mount. I cannot find a rail this will actually sit flush on.
What a let down
*** BPA Response: Sorry about your disappointment! These rails are made by Bullpup Unlimited, Inc and are specifically for the Shotgun kits they make. So the design contours to the BPU chassis.
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Buildup unlimited 90 degree side mount
March 4, 2021
Reviewer:
Anonymous Person from LIVINGSTON, TX United States
Works excellent as a light mount on a Hi-Point 4595 carbine with long top rail.
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February 26, 2021
Reviewer:
Guillermo Lopez-Torres from Portchester , NY United States
Excellent product, Fast Delivery. Thanks.
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Exactly what I needed.
February 3, 2021
Reviewer:
NATHANIEL STAMPER from CUYAHOGA FALLS, OH United States
Was hesitant due it being polymer but it worked perfectly for what I needed. It's strong durable polymer as well.
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Super service
February 2, 2021
Reviewer:
Philip Vancil from Lake City, FL United States
Product was exactly as stated on the site. Shipment vas fast. They keep me informed via email.
90 degree side rail mount 
Buildup unlimited 90 degree side mount