[Vpmedia]

imho the file affected is weapon.MGunM4_75.prs

currently

[common]
mode relobj pos
numadj 1

[spl]
140

[samples]
gun_big_06.wav
air_can_04i.wav

[sample.gun_big_06.wav]
env 0 2

[sample.air_can_04i.wav]
env 8

I'd try to change it like this:

[common]
mode relobj pos
numadj 1

[spl]
140

[samples]
m4_75_new1.wav (*your samples with new names)
m4_75_new2.wav

[sample.m4_75_new1.wav]
env 0 2

[sample.m4_75_new2.wav]
env 8