If the rifle is a centerfeed, (which it probably is) you could send the stock to SSS and have them inlet for the DBM/HFP hardware. Purchase whatever bottom metal you'd like, and use existing mag box/follower.
SSS could sell you the parts for the HFP.
Or,
You could become a paid member for $12 a year, and purchase the HFP bottom metal that I have listed in the classifieds.
(Shameless plug, )
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