Im in the process of building an AR-9 pistol and bought a Burris FastFire II. I put my upper on a pistol lower at a gun shop (my lower hasnt come in yet) and realized the optic is too low profile to acquire the red dot. Was told Id need to put a riser on it. A 1" riser seems too high (id like it to remain as low profile as possible). Would a 1/2" be too low?? Or would I need at least a 3/4"?? I really dont want to have to buy another optic. Any suggestions? Also, the optic does NOT need to coincide with any BUIS, for i dont have any on it.
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