This review of the ATI Halo Side Saddle for Mossberg 500/590 highlights its modular design, integrated rail for optics like the Burris FastFire, and secure shell retention via rubber inserts. Testing confirmed the mount's ability to hold zero under recoil and maintain shell security with both slugs and buckshot. Notably, the design allows for firearm disassembly for cleaning without removing the mount, and provides access to the serial number.
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