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Two part question: What is the tube diameter of the scope, and what is the recommended ring height for it to co-witness with standard AR iron sights? — 1 Answer
by
GoMopar440,
from MT, United States Asked on April 15, 2021
SIG SAUER Sierra3BDX 5x20mm Rifle Scope Combo Kit 30mm Tube
Answered by
Ethan,
Gear Expert,
from IL, United States,
on May 09, 2022
The Sig Sauer Sierra3BDX 5x20mm Rifle Scope uses a 30mm maintube. I would recommend using a dedicated AR15 scope mount. Trying to co-witness this scope with iron sights would not work because the scope will un-focus your front sight. Using an AR15 scope mount like the Aero Precision Ultralight 30mm Scope Mount (linked below) would be my recommendation. https://www.opticsplanet.com/aero-precision-ultralight-30mm-scope-mount-spr.html
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