Mass Effect trilogy is build on Unreal Engine 3 which base settings can be tweaked by editing game configuration files - .ini-s.

Coalesced.bin - main configuration file, where all game settings are stored. It is combined file of several ini-s.
Location: Mass Effect 3\BioGame\CookedPCConsole\...
Configs for all types of weapons (base game) are stored here;
Configs for DLC weapons are stored in DLC folders:  Mass Effect 3\BioGame\DLC\<dlc_name>\CookedPCConsole\...

Main goal of this tweaks for weapons:
- Make guns in ME3 as close as possible to match ME1 guns;
- Make patch for all ME3 guns: fix several parameters that will make all guns unique and useful;
- Balance (Damage, Fire rate, Magazine size);
- Balance for weapon upgrades;

Main changes (for Base game and DLC weapons):
- weapons have infinite ammo (except heavy weapons); /optional download/;
- increased damage;
- increased accuracy;
- increased rate of fire;
- balanced reload speed;
- removed recoil (animation left);
- increased magazine size + spare ammo;
- squadmates (henchman) will deal same amount of damage as you;
- you can change squadmate`s weapon loadouts;
- all weapons now can use upgrades from different weapon types - 18 upgrades total for each weapon type;
- change weapon colors (when you install upgrades);
- balanced weapon weight;
- added all heavy weapons from ME2;
- heavy weapons always available - you can add them for player by hotkey;
/ No one says that this option would be balanced - all is up to you how often you want to use them /;


All weapon properties descriptions are provided in Readme file;
All weapon stats changes and comparison are provided in tables (.xsl files); /in each mod/
Instruction how to change weapon types for your player class and your squadmates are provided in Readme file;

====================== ME1 - style guns ======================

Infinite ammo (exept heavy weapons) - guns don`t consume spare ammo, enemies don`t drop ammo;
In ME1, according to codex, there we no such thing as weapon recoil - so here this option completely removed (there is only animation of shooting from the weapon remains).
You can shoot from the gun with the same accuracy as it was before in ME1 (with no 100% chance, of course).

====================== Heavy weapons ======================

- [<Num 1>] - M-451 Firestorm (Flamethrower);
- [<Num 2>] - Geth Spitfire (Minigun);
- [<Num 3>] - Collector Particle Beam;
- [<Num 4>] - M-100 Grenade Launcher;
- [<Num 5>] - M-622 Avalanche;
- [<Num 6>] - Arc Projector;
- [<Num 7>] - M-597 Ladon (ML-77 Missile Launcher);
- [<Num 8>] - M-560 Hydra;
- [<Num 9>] - Reaper Blackstar;
- [<Num 0>] - M-920 Cain;

Adding HW to game through this way caused ALL HW disappearance from game levels. Normaly its not an issue or bug, but:
! Attention ! In Priority: Earth mission there will be no Cains to shoot Spider reaper - you must manualy ADD it to take it down;

====================== INSTALLATION - first of all MAKE BKP ======================

Versions:
- Infinite ammo - guns don`t consume spare ammo, enemies don`t drop ammo;
- Base - guns consume spare ammo (by default), enemies can drop ammo;

1) - Place dll files from 'Warranty Voider's DLLs' to: Mass Effect 3\Binaries\Win32 > override ? > yes.
// Dll files needed for skip DLC initialization check //;
2) DLC installation:
Place 'DLC_MOD_ARSENAL_IAmmo' or 'DLC_MOD_ARSENAL_Base' to: Mass Effect 3\BioGame\DLC\

+++ Alternative DLC installation via Mod Manager +++
 - Open Mod Manager > Mod Management > Import mod > Import mod from archive > Browse > select 'Weaponry tweaks Infinite ammo' or 'Weaponry tweaks Base' from 'For MM' folder;
 - Apply Mod /it will be added to DLC folder (Mass Effect 3\BioGame\DLC\)/;

+++ Optional download +++
Base and Infinite_ammo installations if you want to edit weapons:

1) - Disable auto updating in Origin or your files will be replaced with defaults (vanilla);
2) - Unpack game resources by ME3Explorer;
3) - Place 'BIOGame' folder to Mass Effect 3 installation folder > override ? > yes.
// modified files: bioweapon, biogame, bioinput; (for base game and DLC) //;

+++ Compatibility +++
- DLC mod NOT compatible with other mods that edit weapon mechanics (not textures);
/unless they have low mount priority - this mod has: 7777 and 7778; with lower values other mods will be overridden/;
- Source files mod NOT compatible with other Coalesced.bin mods, that modified bioweapon, biogame, bioinput files;
/ unless you manually edit/merge this files /;
- DLC mods will override non-DLC Coalesced.bin modifications (if you have edited Coalesced.bin directly and than installed DLC mods);
- Any other mods - full compatible;

+++ Notes +++
- Mod provides modifications for all existing ME3 singleplayer weapons (none of multiplayer guns modded). I added required dlc-s, which contain weapons - if you don`t have some of them - just install those you have (see table in mod archive).
- Traditionally Coalesced.bin mods are not allowed in multiplayer, so if you want to play in it - temporary remove/disable mod;
// For Base/Infinite_ammo: make similar folder structure as in mod with your modded Coalesced.bin-s and copy Biogame folder with override to ME3 installation folder //;
- Default Coalesced.bin-s included.

+++ Mod disabling +++
To disable a DLC mod, place any prefix in front of its DLC folder name ("DLC_MOD_ARSENAL_Base" becomes "X_DLC_MOD_ARSENAL_Base"). This will force the game ignore the mod.
// this option included in Mod Manager: Restore > Custom DLC Manager > Click on mod (this should disable it) //;
To deinstall mod just delete  mod DLC folder.


====================== EDIT ======================
Download:
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Wench Coalesced editor
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Mass Effect 3 Coalesced.bin tool
Homepage
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How to use: // Mass Effect 3 Coalesced.bin tool disassembles  Coalesced.bin to .json files, which can be assembled back after adding changes //

To decompile:
- Drop a Coalesced.bin file into the "Gibbed.MassEffect3.Coalesced.EXE" to decompile the .bin file into .json files. It will decompile .bin to a folder with the same filename (same as DLC);
- Remove/move for backup Coalesced.bin;
- Edit file(s) with Notepad++;
To (re)compile:
- Drop the folder with the .json files (that were decompiled) back onto the "Gibbed.MassEffect3.Coalesce.EXE". It will make a new .bin file with the same filename (same as DLC);
- Place New Coalesced.bin to its folder;
Weapon settings are stored in: Coalesced / 10_bioweapon.json;
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Mass Effect 3 Mod Manager
Use TankMaster`s Coalesce Interface
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How to use: // TankMaster`s Coalesce Interface disassembles  Coalesced.bin to .xml files, which can be assembled back after adding changes //

To decompile:
- Drop a Coalesced.bin file into the opened Mod Managed window to decompile the .bin file into .xml files. It will decompile .bin to a folder with the same filename (same as DLC);
- Remove/move for backup Coalesced.bin;
- Edit file(s) with Notepad++;
To (re)compile:
- Drop the manifest .xml file with the same name of DLC (that was decompiled) back onto the opened Mod Managed window. It will make a new .bin file with the same filename (same as DLC);
- Place New Coalesced.bin to its folder;
Weapon settings are stored in: Coalesced / bioweapon.xml;
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Download Notepad++ 6.9.1
DO NOT USE: Word, Wordpad or Notepad - this will screw up your game;
- go to decompiled Coalesced folder and open 10_bioweapon.json or bioweapon.xml;
- in there > right-click on bioweapon > open with notepad++;

// How to compare two files in Notepad++ ? //
In Notepad++ add plugin "Compare": main panel > plugins > plugin manager > show plugin manager > find plugin Compare > Install > (if program asks if you would like to update manager? - yes, only once). Open two 10_bioweapon.json-s (or .xml-s) > main panel > plugins > Compare > select one of two files > Set a first to compare > switch to second file > plugins > Compare > Compare;
Now you can see differences between two files - they are highlighted;

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How to edit my DLC:

- Open my DLC folder
- Decompile DLC`s .bin
- Delete DLC`s .bin
- Open decompiled DLC folder > Open file that you want to edit in Notepad++
- Open default base game Coalesced`s / default DLC`s folder
- Decompile .bin(s)
- Open file that you want to edit in Notepad++
- Use Nodepad++ Compare plugin
- In default file select desired code line(s) > paste it to my DLC file  /  or edit value(s) there
- Save file(s)
- Compile my DLC
- Delete decompiled DLC bin folder
- ME3 Explorer / ME3 Mod Manager run AutoTOC utility
/reload ME3 MM/


====================== NOTES ======================

You can always edit weapon properties as you want: with this mod file or your default/modded Coalesced.bin-s;

ME1 style guns mod (heat system for guns) still in research/construction. Suggestions for mod improvement are welcome!

====================== My Mass Effect trilogy mods ======================

ME3 Graphics tweaks
ME3 Gameplay tweaks

ME1 Graphics tweaks
ME1 Gameplay tweaks

ME2 Graphics tweaks
ME2 Gameplay tweaks
ME2 Weaponry tweaks
ME2 Armory tweaks