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Half of the manufacturers offer lifetime warranty so you should be good to go.....that's if you purchase one with lifetime warranty
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The purpose of a warranty is to protect the owner against loss due to defects in materials or workmanship. It does not cover wear and tear or abuse. It certainly does not cover baffle strikes from misalignment, bullet instability, etc. It does not cover misuse, such as mounting a rimfire suppressor on a .220 Swift, and so forth.
Lifespan depends on a number of factors: caliber, ammunition, host weapon, and duty cycle. In 5.56 NATO, we have had suppressors last in excess of 100,000 rounds of the 5.56 NATO ammo. I have also destroyed them (ours as well as competition) in less that 400 rounds with abusive firing cycles.
Most manufacturers spend time in doing engineering for safety and performance as well as testing. A summary of what they consider safe is in the manual that accompanies the weapon. There is a lot of merit in actually reading the instruction manual.