Ah, this is what I was thinking of. Thanks.
Printable View
Monty has the midlength cutout in stock if anyone is looking for one.
https://www.centurionarms.com/product-p/0609-mc.htm
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So does Lanbosarmory
Saw this on Reddit. Pretty sweet homemade setup.
https://i.redd.it/0vjlzf8vvntx.jpg
I just got an e-mail from BCM saying that the 12 inch cut out rail was back in stock. http://www.bravocompanyusa.com/Centu...-06012-fsp.htm