Preface: Recoil > Ergo / Weight. The TX-15, M4, and ADAR builds are the same. This is a resource for me primarily and a resource for the community secondarily. So no, I wont do ergo or weight builds. I'm planning to incorporate all the modding guides this wipe into one long meta post discussing the ammo / gun economy to rationalize the price to performance for all the guns in the game. I'll be discussing economy builds there.
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Attachments
Barrel: 370mm / long M4 barrel [Peacekeeper 3] (or 408mm / adar barrel if you don't care about ergo [Skier 2])
Upper: MUR-1S [ Peacekeeper 4 ]
Handguard: SAI 14.5" QD with a jailbreak [Skier 4] and a 4.1" mlok guide rail [Mechanic 2]
Muzzle Break: Bulletec ST-6012 [Mechanic 4] (yes you can put this on with a jailbreak. No you can't use a CQB instead)
Stock : HK E1 [Peacekeeper 4] (or MFT BUS if you don't car about ergo)
Buffer Tube: Advanced Buffer Tube [ Mechanic 4 ] (red one has more accuracy because *grunt* red make good *hits ground with hatchet* )
Optic: Cobra EKP-8-18 [Prapor 2] (yes this reduces recoil, no I don't know why)
Foregrip: RK-2 [Skier 4]
Pistol Grip: HK Ergo PSG-1 [Mechanic 4] (only for ergo)
Charging Handle: Raptor [ Mechanic 3 ] (only for ego)
Gas Block: Low Profile [peacekeeper 3 or mechanic 2]
Magazine: TROY Battlemag for 30s [mechanic 4] (the quad stack 60 has more ergo than the drum 60)
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Final Stats as of 11/27 with no magazine
Vertical Recoil
M4: 31
ADAR: 31
TX-15: 29
Horizontal Recoil
M4: 85
ADAR: 85
TX-15: 80
Ergo
M4: 82
ADAR: 82
TX-15: 84
Source: https://www.reddit.com/r/EscapefromTarkov/comments/e2sdc9/tldr_m4_tx15_adar_modding_lowest_recoil/