Horus Spotting Scope 6.5-40x50 107gr It screws into the front

It screws into the front tunnel sight (diopter) and provides magnification as listed above

AR bolt and bolt carriers

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Horus Spotting Scope 6.5-40x50 107gr It screws into the frontWith extraordinary optical quality, the Horus Spotting Scope provides an improved viewing experience even at extended distances. The optimized optical design and broadband multi coated glass provide exceptional clarity for observation and viewing of bullet trace. The Horus HoVR 6. 5 40x50mm Spotting Scope is the perfect companion to the Horus Complete Shooter Package or any Milliradian based riflescope. The Spotter is lightweight, compact, and rugged