Adding the jsrs_soundeffect = "JSRS2_Distance_Effects_l85"; line to a weapon config works although the sound files are missing, You get an error upon firing the weapon. 
However adding jsrs_soundeffect = "JSRS2_Distance_Effects_m4"; works and the sound files are present. 
Is it intentional that you did not add certain weapon sounds or are you planing on adding them later? 
Thank you