You should just learn how to do the mods... DTX files go into GUNS_T_... And LTB files go into GUNS_M_... The part after GUNS_M or GUNS_T is what type of gun it is. For example, If you were to inject a DTX file that was a mod for your Sniper, You'd inject it into GUNS_T_PV_SR (SR stands for Sniper Rifle).
If you don't know how to inject, It's really easy. Here's my video tutorial about it.
If this helped, Thank me and/or +REP me. If it didn't, Message me. And I'll teach you.