I recommend the following as it gives you the option to switch to an M5 DBM later if you wish and is also setup for the longer OAL of the extended wyatt's boxes. Catch is your stock should be inlet for M5 bottom metal instead of factory, which isn't a big deal if you're ordering the stock but it would need to be inlet to M5 if you already have it:
https://hawkinsprecision.com/product/m5-oberndorf-bottom-metal/
