if it were me i'd buy a rail mounted scope ring or something to that effect... i'm not the biggest truster of velcro it seems like it would be solid enough.

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Proud Canadian Baller
Kit: A5, camo job, polished internals, 14" Smart Parts Progressive barrel. Borrowed Opsgear G36 stock. 24oz CO2 w/ remote and slide check. Neat homemade sling. MORE TO COME
Vents Goggles and Multicam