Surviving the infected horde requires massive burst damage when a defensive perimeter collapses. In Peak Development Studios' zombie survival shooter, the Those Who Remain M320 stands out as one of the most destructive secondary options in the entire arsenal. Reaching high waves demands weapons that eliminate entire clumps of zombies in a single trigger pull, which is precisely why high-tier players prioritize unlocking the Those Who Remain M320.
First released on Roblox on August 24, 2016, Those Who Remain (universe 187796008, place 488667523) was developed under programming and game design by nin900500, creative associate GoAirborne, and original creative direction by Ardwyck. Supporting assets and media were built alongside contributors including B. Chuck & Friend (infected sounds), spas12kick (infected animations), nocturnaliss (dog and reindeer animations), bioxx03, Mustrive, AbsolutelyGarbage134, Neu, and Director1406 (music composition). As a free-to-play PvE shooter supporting up to 50 players per server, the game challenges survivors to hold out against endless waves of infected, scavenge items to keep teammates alive, establish fortifications, and complete map objectives before being overrun.
This comprehensive guide covers weapon mechanics, level requirements, purchase costs, and ideal perk pairings.
Those Who Remain M320 Overview and Core Mechanics
The Those Who Remain M320 functions as a secondary explosive weapon designed specifically for high-impact crowd control. Unlike conventional pistols, shotguns, or submachine guns in the secondary category, the M320 fires high-explosive ordnance that detonates immediately on contact with infected targets or surfaces.
According to player gameplay testing, the launcher features max damage ratings, allowing a single well-aimed grenade to wipe out an entire horde of standard infected instantly. This makes it an extraordinary panic button whenever players get cornered by sprinters or compressed inside tight corridors. In the weapon update that introduced the M320, developers also updated the game's explosion effects to scale dynamically based on explosion size, while expanding the reserve ammo pools for weapons like the CZ Scorpion Evo Micro K, CBJ-MS, and Gepard PDW.
The launcher holds one round in the chamber with an ammo reserve capacity of nine rounds (1/9 capacity). Because of its single-shot nature, players experience a slow reload between each discharge. However, the weapon compensates with generous ammo replenishment compared to other heavy explosives: picking up an ammo box restores three rounds directly to your reserve.
| Weapon Attribute | Those Who Remain M320 | RPG-7 |
|---|---|---|
| Weapon Slot | Secondary | Primary |
| Damage Output | Max Damage (Explosive) | Max Damage (Explosive) |
| Magazine / Chamber | 1 Round | 1 Rocket |
| Reserve Ammo Capacity | 9 Rounds | 9 Rockets |
| Ammo Box Replenishment | +3 Rounds per pickup | +2 Rockets per pickup |
| Base Unlock Level | Level 150 | Level 125 |
| Base Purchase Price | $2,000,000 | 1.25 million dollars |
As shown in the comparison, the M320 shares the devastating single-shot profile of the primary RPG-7 while freeing up your primary slot for sustained automatic fire. Its superior ammo recovery rate also makes it easier to sustain across prolonged defense phases.
Unlock Requirements and Early Purchase Cost Scaling
Reaching the unlock requirement for the M320 represents one of the longest progression milestones in the game. Official game level progression tables confirm that the weapon unlocks naturally at Level 150, where it becomes available alongside the MG 42 machine gun. Reaching Level 150 requires a cumulative total of 28,406,875 experience points, rewards the player with a $22,500 credit payout, and demands 570,025 experience to complete the requirement for the next level.
At Level 150, the baseline purchase price is $2,000,000. However, players who have accumulated substantial cash reserves can choose to buy the weapon before reaching Level 150. Weapon prices in the armory decrease linearly as your character level approaches the designated unlock milestone. Unlike weapons, perks in Those Who Remain cannot be purchased early; they remain strictly level-locked and require players to reach their predetermined rank before they can be equipped.
The price reduction per level is determined by the official wiki pricing formula:
- Price Drop per Level = |Cost_C - Cost_R| / |Level_C - Level_R|
In this formula, Cost_C and Level_C represent your current weapon price and level, while Cost_R and Level_R represent the eventual weapon cost and required unlock level. For the M320, data shows the weapon costs $5,733,333 at Level 115 and $2,000,000 at Level 150. Calculating |5733333 - 2000000| / |115 - 150| produces a linear reduction rate of approximately $106,667 per level gained. Based on this formula, a brand-new player at Level 1 would face a theoretical early purchase price of roughly $17,893,333 (calculated as 2000000 + 106667 * (150 - 1)). Some weapons across the progression table possess non-integer cost decreases per level.
Leveling up requires progressively more experience according to the game's core progression formula:
- Next Level Experience Requirement = 25 x (Level + 1)^2
For example, a player at Level 86 must accumulate 25 x (86 + 1)^2 = 189,225 experience to advance to Level 87. In turn, leveling up rewards players with credits according to the formula:
- Level Credits Reward = Level x $150
Reaching Level 87 grants $13,050, while reaching Level 150 awards $22,500. Players are permitted to progress beyond Level 150; while there are no additional unlockable weapons or perks currently scheduled beyond that threshold, the credit reward formula continues to grant cash upon every level up. Furthermore, the game enforces strict anti-cheat policies: exploiting, glitching, or cheating can result in a total account data reset, which negates Developer Product purchases.
Optimal Loadouts and Endless Mode Tactics
Because the M320 is locked to the secondary weapon slot, it allows players to build versatile loadouts suited for crowd clearing and high-wave survival. To test your loadouts across various community servers, visit the official Roblox game page and launch into an active session.
Primary Weapon Pairings
- M60 Light Machine Gun: Unlocked at Level 75 (which grants an $11,250 level reward), the M60 offers massive magazine capacity and sustained fire. Community players frequently recommend the M320 as a direct backup to the M60, allowing players to mow down incoming lines and swap instantly to the explosive launcher when heavy clumps breakthrough.
- Flamethrower: Unlocked at Level 65 (alongside the Spiked Baseball Bat, granting a $9,750 level reward), the Flamethrower is an elite leveling tool that grants a bonus between 3 and 13 XP and cash per kill. Conserving fuel through controlled tap-firing allows players to reap higher bonuses than standard headshots, while the secondary M320 provides instant explosive burst capability for emergency situations.
Perk Synergies for Explosive Play
Selecting complementary perks maximizes your fortification durability and tactical mobility while managing heavy weapon loadouts:
- Play Maker (Craftsman Tree): Unlocked at Level 10 alongside Hardened Sight and Dexterous, this perk provides an extra Clap Bomb (giving players two Clap Bombs in total), bolstering defensive explosive options and point-scoring potential alongside launcher rounds.
- Carpenter (Craftsman Tree): Unlocked at Level 85 alongside Speed Demon and Brisk, Carpenter significantly accelerates build speed when setting up fortifications, allowing you to rapidly deploy barriers between launcher shots.
- Fortifier (Perk Tree): Unlocked at Level 45 alongside Caffeinated and Heavy Hitter, Fortifier grants extra barbed wire (two barbed wire items), enabling survivors to construct protective perimeters faster and direct the flow of zombies into explosive blast zones.
Endless Market Defense Strategy
Experienced players utilize an established strategy on the Endless Market map (one of the dedicated Endless maps alongside Dealership) to farm XP and credits rapidly:
- Gather all barbed wire scattered across the map during Wave 1 preparation.
- Position four strands of barbed wire directly across the front window chokepoint where infected emerge.
- Camp the defensive corner using the Flamethrower for primary crowd clearing to farm the 3 to 13 XP and money kill bonus.
- Keep the M320 equipped as your reserve defense weapon to blow clear any horde that threatens to bypass the barbed wire traps.
- Replenish wire reserves between waves and maintain ammo pickups to keep launcher reserves full. Players can also utilize a partner or alternate account stationed in the corner to lure infected away from the generator during setup phases.
Weapon Mastery Concepts and Development Insights
Weapon mastery concepts shared within community showcase videos revealed potential future cosmetic and functional attachments for various armory items. In early design previews sourced from community collaborator Oslac, showcase models for the Those Who Remain M320 featured an integrated red dot sight alongside an auxiliary upper module, conceptualized as a rangefinder, infrared laser, or UV light.
Community updates emphasized that these weapon mastery designs represent preliminary visual concepts rather than final gameplay mechanics. Modeling concepts across other armory weapons—such as drum magazines on the Makarov, Glock 17, and Thompson, specialized optics on the SVDM and M14, and attachments for the OTs-14 Groza, SKO Shorty, P320, FAL, PPSh-41, Taurus Judge, ASh-12, Tec-9, Serbu Super Shorty, LWRC IC-PSD, UMP45, Winchester Model 70, Aero Survival Rifle, M16A1, AA-12, P90, and AUG—remain in the modeling phase. Programming and scripting for masteries, alternate ammunition types (such as dragon's breath or explosive fragmentation shells), and underslung launchers have not yet been implemented, leaving all concepts subject to revision by Peak Development Studios.
Combat Tips for Maximizing Ammo Value
Because the M320 carries a strict limit of nine reserve rounds, careless firing can quickly deplete your ordnance. Use these tactical habits to get the most value out of every shell:
- Avoid Single-Target Engagements: Never discharge an M320 shell at an isolated infected. Reserve your launcher rounds strictly for dense waves, trapped teammates, or sudden rushes from sprinters.
- Leverage Contact Detonation: The M320 explodes on contact, meaning you can aim directly at the feet of an advancing horde or fire against nearby walls to catch flanking enemies in the blast radius.
- Prioritize Ammo Pickups: Ammo crates grant three reserve rounds for the launcher, whereas primary rocket systems like the RPG-7 receive only two rockets per box. Coordinate with teammates so players carrying heavy ordnance collect supply crates when reserves run low.
- Capitalize on Blast Scaling: Take advantage of the game's scaled explosion radius to strike packed clusters of civilian and sprinter infected, clearing entire corridors with single shots.
Frequently Asked Questions
What level is required to unlock the Those Who Remain M320?
The weapon officially unlocks at Level 150, costing a baseline price of $2,000,000. Players below Level 150 can choose to purchase the launcher early, with prices scaling downward by approximately $106,667 for each character level gained from the baseline Level 1 calculation of $17,893,333.
How much ammo does the M320 hold in Those Who Remain?
The launcher holds one round loaded in the barrel and nine rounds in reserve (1/9 ammo profile). Picking up an ammo box on the map replenishes three rounds to your reserves.
Is the Those Who Remain M320 classified as a primary or secondary weapon?
The M320 is classified as a secondary weapon. This makes it unique because it allows players to equip a full-sized primary rifle, machine gun, or flamethrower while keeping an explosive launcher ready for emergency crowd clearing.
What is the best primary weapon to pair with the Those Who Remain M320?
The two most effective primary choices are the M60 light machine gun for large-magazine crowd control and the Flamethrower for bonus XP and cash farming in Endless mode sessions.