I just installed a Harris HBRS 6-9 in. bipod on my Mini-14 using the HB14 adapter. I installed as recommended in the Harris instructions, but I end up with a gap between the adapter and the forearm stock. Try as I might, I couldn't get the adapter flush. Am I doing something wrong? The installation seems rock solid, even after multiple test deployments; I haven't taken it to the range yet, so I don't know how it will handle recoil. I have seen some pictures of this bipod installed, most flush, some with a gap. Any advice or comments?