I think that I more or less broke even weight-wise when I swapped my hinged-Floorplate Howa 1500 bottom metal for a Pacific Gauge and Tool detachable AICS magazine system. The aluminum PGT Magwell and Trigger Guard weigh a bit less than the steel Howa bottom metal, but add a steel AICS magazine and they become pretty close. You might actually save a tiny bit of weight if you go with AICS P-Mags, although probably not enough to notice...
For what rifle/cartridge?
It will come in within an ounce of the factory unit... I have used the PTG steel metal on a few M70's... weight would not be a consideration... but the fit and finish is very nice on the PTG steel.
...it will not be lighter than the original Rem bottom metal.




























