Re: DBM systems pros and cons
I'm not certain as to whether it was answered yet or not, but PT&G is shorthand for Pacific Tool & Gauge. A company who, amongst other things, makes aftermarket parts for Remingtons & other rifles. As well as tooling + tools to work on same. One variety of said parts which they manufacture are several varieties of DBM floor metal. You can take a peek here
http://www.pacifictoolandgauge.com/remingtonperf.htm
And it's definitely worth giving them a phone call, as they're both very friendly & helpful, along with being a wealth of infomation. IE; they kinda' define customer service & satisfaction, in my experience.
Again, I hope I'm not repeating something which has been asked & answered. But when one switches to most of the DBM systems out there, specifically, the non drop in units, then yes, the underside of the stock Must be re-inletted. And in the case of an HS Precision stock, some of the integral aluminum block which runs the length of the stock, must be milled away.
This is because the inlet for the DBM floor metal is; longer, wider, & deeper, than is the case for factory BDL metal. And the depth of the inlet + length of the pillars is critical to getting the DBM guard to sit at the correct distance from the action in order to get the rounds to feed smoothly & reliably from the magazines when the bolt is manipulated.
If that's unclear, I can try & explain it again. But your best bet to clear up much of this is to pick a good smith, like say the gents at APA or GAP & talk to them live. And once you've picked out what make of DBM you plan to use, ship the DBM hardware, as well as your rig to their shop, & have them install everything.
It's definitely worth it, especially as they have CNC mills which will precisely inlet a stock for bottom metal X, or Y. In addition to their experience & expertise in having installed these types of setups in hundreds of rifles.