Pros:

gives a different feel to the guns
sounds reminiscent of something realistic

Cons:

sounds EXTREMELY quiet
echo is way too overdone for some areas
sounds like someone from 50 feet away is firing the gun, rather than you
sounds sharp but weak

Conclusion:

I can understand that you took the audio from the battlefield game but please try not to copy paste, a gun in a swamp compared to a gun in the desert would have a much different sound, preferably the echo and sharpness of it, but the guns shouldn't be so quiet in general, if people would like them to be much quieter since these sounds can be counted as some of the majority of the effects, they would turn their sounds down. 5.5 for idea but little effort