Description
Product Overview
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Standard Spacer for Comp™M4 / M4s sight models, can also be used with Comp™M3 / ML3 and PRO™ optics in conjunction with Base and Top Ring
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Mount raises height of optical axis from 30 to 39 mm
Screws and Allen key included.



![[P55340] Starting Key (2-Pack)](https://www.greatdiyhardware.com/wp-content/uploads/2026/07/p55340-starting-key-2-pack.webp)
