Spotting Scopes Gone Wild - The KDG Optics Hub -The Firearm Blog
The Optics HUB - M-LOK Spotting Scope Housing - Kinetic Development Group LLC
Ashbury Precision (APO) :: Mounts and Accessories :: Spotting Scope Accessory Rail [SSAR] - Sniper Tools Design Co - Home of the Angle Cosine Indicator