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The arisaka inline mount does not work with the hl-x. You need the offset mount. This info is also included on the arisaka website.
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It does work, but you have to modify a 1/8" Allen key to tighten the front most M-lok screw because it's covered by the longer HL-X body. If you take the short side of the L-key and chop it down so it can fit between the body and mount, then you can tighten the screw.
It's not advisable to do this with the KeyMod version of the mount because it needs a T15 Torx driver for the BCM reverse KeyMod screws. Torx L-keys don't have the same shape along the entire length, so chopping one down results in a round shaft rather than Torx driver.