Acquiring a massive stockpile of Drebin Points (DP) is the primary gateway to unlocking the most powerful arsenal in Metal Gear Solid 4: Guns of the Patriots. Whether your goal is the 5-million DP Stealth Camouflage or simply a steady supply of non-lethal ammunition, understanding the mechanics of the DP system is essential. The most immediate boost comes from a specific terminal entry in Act 4, but long-term wealth requires mastering the "War Economy" and knowing which weapons provide the highest return on investment.

The Secret 100,000 Drebin Points Code

During Act 4 (Shadow Moses), specifically in the Nuclear Warhead Storage Building B2, you will reach Otacon’s office. At a certain point in the story, Snake must interact with a computer terminal. While the narrative provides a specific code to progress the mission, the terminal accepts several secret inputs that grant immediate rewards.

To claim a one-time bonus of 100,000 DP, enter the code 14893.

Even though the computer may display an "Access Denied" message or fail to progress the story plot with this specific number, the points are instantly credited to your account. It is important to note that this code can only be used once per playthrough. If you are running multiple New Game Plus sessions to farm for the Big Boss Emblem or high-tier weapons, remember to visit this terminal in every run. Other useful codes for this same terminal include 78925 and 13462, which unlock specific iPod tracks that provide passive gameplay buffs, such as increased accuracy.

Understanding the Drebin Points Formula

The amount of DP you receive for picking up a duplicate weapon is not random. It is determined by a rigid mathematical formula hard-coded into the game’s engine. Understanding this allows you to prioritize which enemies to loot and which areas are worth the risk.

The Basic Formula: DP = (Gun Base Value) * (Method of Acquirement) * (Difficulty & Act Scaling)

1. Gun Base Value

Every weapon has an intrinsic value. For example:

  • XM320 (Grenade Launcher): 12,000 DP
  • Masterkey (Shotgun Attachment): 9,000 DP
  • RPG-7: 6,000 DP
  • PSS (Silent Pistol): 5,000 DP
  • P90: 1,500 DP
  • MK. 17: 1,050 DP
  • AK-102: 720 DP

2. Method of Acquirement

How you obtain the weapon significantly impacts the payout. If you tranquilize an enemy or use non-lethal means (Stun/Sleep), you only receive a 0.2x multiplier. This is a balancing mechanic to prevent non-lethal runs from becoming too lucrative too quickly. However, if you pick up a weapon from the ground while your inventory for that weapon is already full—such as after a hold-up, a CQC disarm, or finding pre-placed spawns—you receive a 1.0x multiplier.

3. Difficulty and Act Scaling

The game rewards you more for scavenging in later acts and on higher difficulties. On "The Boss Extreme" difficulty, the scaling is tighter to reflect the scarcity of resources, but the resale value of high-end equipment remains a viable path to wealth if managed correctly.

High-Efficiency DP Farming Locations

If you have already used the Act 4 code and still find yourself short of the millions needed for the Bandanna or Stealth Suit, several locations offer infinite respawning enemies or high-value weapon drops.

Act 1: The Advent Palace Standoff

Just before entering the Advent Palace, there is a consistent standoff between the local Militia and the PMC forces. Both sides will continuously respawn as long as you do not progress the objective. If you side with the Militia, you can safely wait for PMCs to drop. Collecting the standard rifles here provides a steady stream of ~900 DP per pickup. While slow, it is a safe method for early-game accumulation.

Act 2: Vista Mansion and the RPK Farm

In the Vista Mansion area, the rebels carry RPK light machine guns. These are worth significantly more than the standard AKs found in Act 1. By staying in the outskirts and allowing the PMC and Rebel forces to engage, you can cycle through the battlefield picking up dropped RPKs and MK. 14 battle rifles. Some PMCs in this area also carry PSS pistols (5,000 DP) and M60s, making this one of the most profitable combat zones in the entire game.

Act 2: Confinement Facility XM320 Farm

This is widely considered the best farming spot for mid-game players. At the confinement facility, certain PMCs carry the XM320 grenade launcher attachment. Because the XM320 has a base value of 12,000 DP, even with a non-lethal multiplier, it yields substantial returns. If you can successfully perform hold-ups or disarms here, your DP count will skyrocket in a matter of minutes. The enemies here respawn frequently, allowing for a repetitive loop of high-value harvesting.

Maximizing Your Purchasing Power

Accumulating DP is only half the battle; knowing when to spend it is equally important. Drebin’s shop is subject to several built-in discount windows that can save you millions of points.

The Act 5 "War Economy" Collapse

During Act 5 (Old Sun), the global war economy undergoes a massive shift. In this final chapter, Drebin offers a flat 50% discount on his entire inventory. This is the optimal time to purchase the most expensive items in the game. For instance, the Stealth Camouflage, which normally costs 5,000,000 DP, drops to 2,500,000 DP. It is highly recommended to save all your points until Act 5 unless you absolutely need a specific weapon for a boss fight.

Real-World Holiday and Calendar Discounts

Metal Gear Solid 4 features a system that checks the PlayStation system clock for specific dates.

  • Wednesdays and Sundays: On these days of the week, Drebin offers a 20% discount on all items.
  • Special Dates: Certain real-world holidays may trigger even deeper discounts.

Given the current date of Saturday, April 18, 2026, players should consider waiting until tomorrow, Sunday, to make any major purchases. By combining the Sunday 20% discount with the Act 5 half-off sale, you can acquire high-tier gear at a fraction of the standard cost. If you are playing offline, you can manually adjust your console's system clock to a Sunday to trigger this discount immediately.

The Extras Menu Passwords

In addition to the in-game terminal codes, the "Extras" menu accessible from the title screen allows for the entry of alphanumeric passwords. Many of these passwords unlock weapons that would otherwise require multiple playthroughs or incredibly difficult emblems. For example:

  • aottrykmyn: Unlocks the Altair costume.
  • deskyhstyl: Unlocks the Desert Eagle Long Barrel.
  • mekakorkkk: Unlocks the MK. 23 (SOCOM).
  • mnsoymsyhn: Unlocks the Mosin Nagant.

Using these passwords does not directly grant DP, but it saves you the DP you would have otherwise spent purchasing these weapons from Drebin’s shop. Effectively, every password-unlocked weapon is a "savings" of several thousand to hundreds of thousands of points.

Summary of Best Practices

To maximize your efficiency in MGS4, you should prioritize the following steps:

  1. Always enter 14893 at the Shadow Moses terminal in every playthrough.
  2. Focus on harvesting XM320s and RPGs in Act 2 and Act 3.
  3. Perform hold-ups rather than long-range kills to secure the 1.0x DP multiplier.
  4. Delay all major weapon and ammunition purchases until Act 5.
  5. Schedule your shopping sessions for Sundays to take advantage of the recurring 20% discount.

By following this roadmap, you can easily afford the highest-tier equipment in the game without the need for endless, repetitive grinding. The combination of secret codes and tactical scavenging is the most effective way to dominate the war economy of the patriots.