I have an CDI Precision DBM and love it. They are out of Florida and if you buy their bottom metal they will inlet tour stock for free. You have your choice from Magpul or AICS mags most are 5 round but they have 10 round for the 308 and 5.56 family cartridges. Strongly constructed bottom metal and my 5 round AICS mag weighs a little more than the bottom metal. I love the fast reload, feed and mag change the DBM offers especially if you have a critical moment at and.