+1. As foxx said, go with the metal DBM frame assembly. I would not recommend the plastic frame assembly unless you are trying to shave some weight off a hunting rifle that you plan to be packing around a lot. I have found that even with a metal trigger guard, the plastic frame assembly will allow the the rear action screw to loose overtime resulting in unexplained fliers. The metal frame assembly also works with several aftermarket magazines, like the single shot "Fred Sled", Dark Eagle 10 RD magazine and Savage 10 RD magazine that won't work in the Axis style frame assembly.