Hello...
I recently inherited an M&P15 Sport II. I want to put a red dot on it for absolute co-witness, as I have another rifle set up like that. I used a 1" riser on my other rifle and mounted a TRS-25. I'd like to put a Holosun 507c on the M&P15. Do I need a riser for the Holosun 507c to absolute co-witness? The M&P15 currently has Magpul flip-up, adjustable metal sights. Can you guys give me some red dot options and tell me what parts (risers or anything else) I will need to absolute co-witness with my current setup? Thanks in advance. You guys are awesome.