Often to go to a floor plate to a detachable mag, or to increase magazine capacity.
Sometimes it is done for aesthetic reasons also, or to upgrade a plastic part to metal (Remington 609/660).
Tighter tolerances, better materials, and aesthetics.
Also as mentioned sometimes to change configurations. ADL to BDL to DM etc.
X2!!Anybody who has owned a 600 series Remington knows that changing the POS rubberized thing that is supposed to be a trigger guard etc, makes a huge difference in the rifle.
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't!
Same reason people put fancy wheels on their Pintos.
Grizz
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"Indeed, no human being has yet lived under conditions which, considering the prevailing climates of the past, can be regarded as normal."
John E. Pfeiffer The Emergence of Man
written in 1969
The bottom metal on a new/old Winchester Model 70 I aquired was mostly made of crude cast pot metal of some sort. The trigger bow was needlessly deep and the floorplate was ill fit to the trigger bow. So I replaced it with a milled aluminum product of different configuration to improve aesthetics as well as function.
This one is also an aftermarket unit for a Model 70. There are tighter tolerences all the way around and the trigger needed to be narrowed to fit the bow in this case.
On peticular rifles there might be more reason than others. On savage mkII rimfire the bottom metal is just sheet metal, and accuracy can be made better with specific torques on screws. The preassure can bend the cheap metal.
Why upgrade bottom metal?
Linear Mode
