I'm going 8.5 on my 300blk SBR also. I went with a 7" BCM KMR hand guard. It has little side ears that stick out just a little farther than the top. Should be a little more gap than MikeD's but less than Horitexan's. The ears make it where an 8 inch barrel is too short, and 8.3 barely works. So 8.5 should have just enough to easily mount my Omega.
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