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Old July 9, 2019, 09:59 PM   #6
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 21,006
Buffers used in firearms cover a range of different functions and constructions. Some are essentially solids designed to "take a hit", without damaging steel on steel contact. Others can range up to various kinds of springs and/or hydraulic cylinders designed to slow down moving parts before stopping them.

See if you can find some kind of non-destructive testing that will give you some reference of the "hardness" of the old buffer you have, compared with the grades of modern materials.

Good Luck!
All else being equal (and it almost never is) bigger bullets tend to work better.
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