Recce 5 Mod 3 with ~500 rounds on a 16" barrel:
Innovative Arms 5.56 "Grunt" spending ~1500 rounds on a 16" and 500 rounds on an 18":
Innovative Arms 7.62 "Deception". ~250 rounds on a 16" .308 and ~ 200 rounds on a 10.5" 5.56mm AR. Note despite the lesser firing schedule compared to the 5.56, the erosion starting on the blast baffle due to the shorter barrels and the extreme heat/unburnt powder:
The wear on my .22 and 9mm cans aren't worth mentioning
Innovative Arms 5.56 "Grunt" spending ~1500 rounds on a 16" and 500 rounds on an 18":
Innovative Arms 7.62 "Deception". ~250 rounds on a 16" .308 and ~ 200 rounds on a 10.5" 5.56mm AR. Note despite the lesser firing schedule compared to the 5.56, the erosion starting on the blast baffle due to the shorter barrels and the extreme heat/unburnt powder:
The wear on my .22 and 9mm cans aren't worth mentioning