The A.R.M.S. Cantilever Extension for the #74 Comp M4 throw lever mount by 0.5" to allow for cowitnessing your red dot with A2 height iron sights. It also moves the sight forward 1.75" to allow for a magnifier, or simply to add eye relief. Spacer is made of durable hard anodized aluminum for years of reliable performance under the most adverse conditions.
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