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I used this .25" riser to get a better sight picture on my sig556R, I've replace the sig stock with a Magpul CRT stock. This provides perfect co-witness with standard AR sights and sig Romeo5. The only back-draw to this or any other Magpul raiser is that if it does not work for you its a bit of a hassle to remove ( I had to remove .5" riser which was too high ).
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