For nearly fifty years, the global firearms industry, military armorers, and civilian shooters relied on a single, multipurpose fluid for weapon maintenance: Cleaner, Lubricant, and Preservative (CLP). Developed in the early 1970s and codified under the U.S. military specification MIL-L-63460 (later updated to MIL-PRF-63460), CLP was hailed as a logistical breakthrough1. It promised to streamline supply chains by replacing various specialized bore solvents, low-temperature oils, and heavy anti-corrosion greases with one versatile liquid3.
Over the past two decades, however, advancements in firearm engineering, the widespread adoption of sound suppressors, and breakthroughs in tribology have exposed the limitations of the CLP formulation. Specialized armorers and elite military units are increasingly moving away from traditional CLP, a shift driven by the physical demands of modern combat rather than marketing trends. High-volume, suppressed fire creates intense heat and carbon fouling that can quickly overwhelm the flash point and shear stability of multipurpose fluids4. Furthermore, the reliance on Polytetrafluoroethylene (PTFE) and other legacy additives has led to mechanical failures under extreme heat while simultaneously facing strict environmental regulations regarding Per- and Polyfluoroalkyl Substances (PFAS)3.
This report analyzes why the industry is moving past CLP. It examines the logistical compromises that led to its creation, the mechanical realities of modern direct-impingement weapons, the chemical failures of older formulations, and the emergence of advanced boundary lubricants and Durable Solid Lubricants (DSL) designed for today’s requirements.
The Historical Compromise of MIL-PRF-63460
To understand why modern engineering has moved away from CLP, it is particularly useful to look at the logistical needs that shaped its development. The goal was not necessarily to maximize a firearm’s lifespan or performance, but to simplify the massive supply chain of the U.S. Department of Defense during the Cold War3.
The “Impossible Specification” and Industrial Warfare Theory
In 1971, the U.S. military issued Purchase Description 48 (PD-48), seeking a single product to maintain its entire weapons portfolio3. At the time, military doctrine focused on “Industrial Warfare,” preparing for large-scale conflicts where systemic efficiency took priority over individual equipment optimization3. Managing separate stocks of bore solvents (MIL-PRF-372), low-temperature oils (MIL-PRF-14107), and heavy preservatives (MIL-PRF-3150) created a complex and vulnerable logistical burden2. Planners believed that consolidating these needs into one fluid would offer significant cost savings and simplicity3.
The resulting standard, MIL-PRF-63460, became known in the industry as the “impossible specification”3. This is because the requirements for cleaning, lubricating, and protecting are often at odds. Dissolving carbon and copper fouling requires penetrating solvents that, by design, break down oils and evaporate quickly9. In contrast, reducing friction requires a fluid with high viscosity and stability that stays on metal surfaces under pressure11. Effective corrosion protection adds another layer of complexity, requiring water-displacing compounds that form a barrier against moisture, as measured by standard ASTM humidity and salt spray tests13.
To combine these competing goals, chemists created a compromised emulsion. Traditional CLP typically uses a light synthetic or mineral base oil mixed with volatile hydrocarbon solvents for cleaning, along with suspended boundary lubricants to provide some protection after the solvents evaporate3.
The 160°F Thermal Disconnect
One of the most significant flaws in the MIL-PRF-63460 specification is its limited thermal range. The specification only requires the fluid to remain stable up to 160°F (71°C)1.
This limit is remarkably low for modern firearms. Weapons like the AR-15 and M16 use a direct impingement gas system that taps superheated, high-pressure gases from the barrel and directs them back into the bolt carrier group (BCG)3. These gases can reach temperatures between 400°F and 1,000°F as they enter the weapon’s internal components3.
Because the military specification was so low, older CLP formulations have low flash points and high volatility3. During sustained fire, the solvent carriers in CLP can boil away rapidly. This leaves the internal parts dry at the exact moment they are facing the most heat and friction3.
Tribological Realities of Modern Small Arms
Modern firearm analysis relies on tribology, the study of interacting surfaces in motion, including friction and wear19.
Lubrication Regimes in Firearms
In industrial engines, wear is typically prevented by hydrodynamic lubrication, where a pump maintains a thick layer of oil that keeps moving parts from touching12. Under these conditions, the fluid itself supports the mechanical load12.
Firearms, however, do not have continuous oiling systems19. Lubricant is applied in small, finite amounts. When a weapon is fired, the extreme pressures—often exceeding 50,000 psi—and the rapid motion of the parts can instantly strip away any thin protective layer of fluid5.
This forces the weapon to rely on boundary lubrication, where protection is determined by a microscopic layer of chemicals adhering to the metal rather than the bulk volume of the oil12. If this layer fails, the microscopic peaks on the metal surfaces (asperities) come into direct, damaging contact20.
Viscosity, Shear Rates, and CLP Failure
Because firearms operate in this boundary regime, a lubricant must stay in place and resist being squeezed out. Viscosity, which measures a fluid’s resistance to flow, is critical here11.
Under military specs, CLP is required to have a very low viscosity—only 14.0 centistokes (cSt) at 40°C5. While this thinness helps the fluid penetrate and clean carbon residue, it is a liability during operation5. The intense motion of the bolt carrier can easily push this thin fluid out of the areas where it is most needed19.
Specific areas like the cam pin track, locking lugs, and carrier rails face extreme stress. Without a way to constantly replenish the lubricant, thin fluids like CLP are quickly stripped away, leading to metal wear and potential malfunctions.
When thin CLP evaporates or is pushed away, the weapon runs dry, leading to higher friction and issues like sluggish cycling or failures to extract and lock19. Historically, the solution was to “run the gun wet” by applying excessive amounts of CLP29. However, this excess fluid can attract dust and sand, creating a sticky paste that can cause jams in harsh environments29.
Suppressor Dynamics and Kinematic Stress
The problems with low-viscosity CLP are even more evident with suppressed weapons. Sound suppressors have moved from specialized tools to standard equipment for many military and law enforcement units, as well as civilian shooters5.
A suppressor works by trapping and slowing down expanding gases to reduce noise and flash5. This creates significant backpressure, forcing more hot, carbon-heavy gas back into the weapon’s receiver5.
This backpressure stresses the lubrication system in several ways:
- Increased Mechanical Stress: The bolt carrier group moves faster and more violently than originally intended, putting more strain on the entire system5.
- Higher Temperatures: Trapped heat causes the receiver to reach levels where CLP can vaporize much sooner than expected5.
- Fouling and Carbon Build-up: Hot carbon blowback mixes with failing lubricant to create an abrasive sludge that can cause the weapon to seize17.
Chemical Limitations and Environmental Regulations
Beyond mechanical issues, the shift away from CLP is also due to the chemicals used in its formulas, specifically how they behave under heat and their impact on the environment.
The Pyrolysis of Polytetrafluoroethylene (PTFE)
To make up for being so thin, traditional CLPs often include solid additives like Polytetrafluoroethylene (PTFE), better known as Teflon3. The idea is that as the liquid evaporates, these microscopic particles remain behind to provide a dry, low-friction layer3.
While this process works in cooler settings, PTFE can fail in firearms. It begins to break down (pyrolyze) at temperatures as low as 325°F to 400°F3. Since gases inside the weapon often exceed these temperatures, the PTFE in CLP can burn away during sustained fire3.
This decomposition doesn’t just stop the lubrication; it releases toxic gases3. Because these gases are vented near the shooter’s face, they can pose a health risk, exposing operators to harmful substances—a risk many professional units now consider unacceptable3.
The Impact of REACH and PFAS Regulations
Firearm lubricants are also being affected by global regulations on PFAS, often called “forever chemicals”6. These include substances like PTFE, which older CLP formulas value for their resistance to water and grease6.
These chemicals do not break down easily and can accumulate in the environment and the human body37. In response, regulatory bodies in the EU and the U.S. are implementing strict bans and restrictions on their use38. Consequently, the industry is shifting away from PFAS-heavy products to mitigate future legal and supply chain risks6.
Recognizing these risks, manufacturers are engineering PTFE out of their products. Relying on legacy formulas is no longer viable for large-scale military or commercial use39.
The Shift to Biobased Standards (MIL-PRF-63460G)
The U.S. military has also recognized the need for change. Prompted by mandates for sustainable and non-toxic materials, the CLP specification has been overhauled41.
In November 2023, the military released MIL-PRF-63460 Revision G1. This update requires all CLP products used by the Department of Defense to contain at least 33% biobased content, moving away from pure petroleum-based formulas16.
These modern biobased CLPs use plant-derived oils that offer better heat resistance and cleaning ability without the use of harsh or toxic chemicals41. Testing has shown that these new formulas can cut cleaning time by 50%, require less fluid, and eliminate much of the toxic smoke produced by older versions while providing equal or better protection42.
The Transition to Specialized Tribological Solutions
Because an “all-in-one” CLP requires so many compromises, many engineers now prefer using specialized products that separate the tasks of cleaning, lubricating, and preserving.
De-coupling the Maintenance System
Decoupling these functions allows each chemical to work more effectively without competing requirements interfering.
- Solvents: Dedicated cleaners can be much more aggressive in dissolving carbon and copper fouling because they don’t need to stay on the metal as a lubricant9.
- Lubricants: Modern weapon oils can focus entirely on heat resistance and film strength. High-quality synthetic fluids—like Polyalphaolefins (PAO) or Gas-to-Liquid (GTL) oils—can handle temperatures over 435°F and stay in place much better than CLP4. These oils are far less likely to boil away or migrate during use19.
The Resurgence of NLGI Greases
Many armorers have returned to using heavy synthetic greases in the highest-stress areas, such as the cam pin track and carrier rails.
Greases are rated by consistency using the NLGI standard, as shown in the table below45.
| NLGI Grade | Consistency / Appearance | Food Analogy | Firearm & Industrial Application |
| 000 | Fluid | Cooking Oil / Ketchup | Legacy CLPs act similarly; easily migrates, runs off sliding surfaces.46 |
| 00 | Semi-fluid | Applesauce | Centralized lubrication systems requiring low temperature pumpability.46 |
| 0 | Soft (Flowing) | Brown Mustard | Excellent for loaded roller sliding bearings; optimal for light firearm rails.46 |
| 1 | Very Soft | Tomato Paste | Used in needles and multiple row roller bearings; ideal for cold-weather firearm lubrication.46 |
| 2 | Normal Grease | Peanut Butter | Standard multipurpose grease; ideal for AR-15 cam pins and high-load locking lugs. Stays in place.46 |
| 3 | Firm | Vegetable Shortening | High-speed industrial bearings; generally too thick for optimal firearm cycling.46 |
| 4 to 6 | Very Firm to Solid | Frozen Yogurt to Cheddar | These are specialized extreme pressure blocks, but they are not applicable for small arms.46 |
While old CLPs have the consistency of thin oil that can easily run off a weapon, modern armorer standards often call for Grade 0 to Grade 2 synthetic greases for key sliding parts45.
A good grease stays exactly where it is put. It acts like a sponge, holding the lubricating oil and releasing it only when the parts are moving and creating friction48. Once the weapon stops, the oil is reabsorbed, preventing it from dripping or pooling49. This ensures the weapon remains ready even after extensive use or long periods of storage36.
Advanced Additive Packages: Mechanochemical Shielding via ZDDP
With PTFE being phased out, engineers are using advanced chemical additives to protect metal surfaces. One of the most successful is Zinc Dialkyldithiophosphate (ZDDP)19.
Unlike PTFE, which just sits on top of the metal, ZDDP reacts chemically with the steel under heat and pressure50. This reaction creates a durable, protective layer directly on the part19.
This process is highly effective. As parts collide during firing, the localized heat causes ZDDP molecules to break down and bond with the steel54. This forms a tough “glass” layer that protects the metal from wearing down52.

Because this layer is sacrificial—meaning it is designed to wear away instead of the steel—it prevents permanent damage to the weapon’s components50. Since the reaction is driven by heat and friction, the protective film actually rebuilds itself where the stress is greatest51.
Standardized wear tests confirm these results. Lubricants rich in ZDDP consistently outperform thin CLPs in protecting metal under extreme pressure5.
Engineering Out the Fluid: Durable Solid Lubricants and Advanced Coatings
The ultimate goal is to eliminate the need for liquid lubricants entirely. This shift is being led by research into permanent surface treatments that change how the metal itself behaves under friction.
ARDEC and Durable Solid Lubricants (DSL)
Military researchers found that the “wet” nature of CLP, which traps sand and grit, often caused weapon failures in dusty environments. To address this issue, they developed Durable Solid Lubricants (DSL)57.
DSL is a permanent treatment applied during manufacturing, not something added by the user59. The goal was to remove the need for CLP in all environments60.
This technology provides low friction, high wear resistance, and corrosion protection without the need for oil61. Because it is dry, carbon and sand don’t stick easily, making the weapon much easier to clean and more reliable in the field64.
Tests show impressive results: one M4A1 fired 10,000 rounds with zero stoppages and no cleaning, thanks to DSL64. In other endurance tests, parts with DSL showed almost no wear after 15,000 rounds compared to those maintained with traditional CLP61.
| Lubrication Method | Component | Measured Wear after 15,000 Rounds | Performance Observation |
| Traditional CLP (Wet) | Bolt Carrier | ~75% loss of phosphate finish | High wear required continuous reapplication and cleaning to prevent stoppage.61 |
| Traditional CLP (Wet) | Bolt | ~90% loss of phosphate finish | Critical wear on sliding surfaces; fluid evaporated or mixed with carbon.61 |
| ARDEC DSL (Dry) | Bolt Carrier | <5% total wear | Maintained lubricity and dimensional stability; required no fluid reapplication.61 |
| ARDEC DSL (Dry) | Bolt | <5% total wear | Near-total elimination of abrasive wear; self-cleaning properties observed.61 |
This tech is now used in high-end commercial products. For example, Geissele Automatics uses a version called “Nanoweapon” for certain military programs33. This treatment creates an incredibly durable surface that makes traditional “wet” lubrication mostly unnecessary33.
Thermochemical Case-Hardening: QPQ Black Nitride
The industry has also adopted processes like QPQ Black Nitride to harden metal parts66.
Unlike coatings that can chip or flake, QPQ is a diffusion process where nitrogen and carbon are integrated into the steel in a high-temperature salt bath67. This creates a deeply hardened layer without adding any measurable thickness to the part67.
This process makes parts extremely slick and durable67. Because the baseline friction is so much lower, any lubricant has to work less intensively.66
Parts treated with black nitride are easier to clean and offer far better corrosion protection than the military standard for liquid CLP67. This type of engineering essentially “designs out” the need for heavy oiling that characterized weapon maintenance in the past16.
Conclusion
The move away from MIL-SPEC CLP is a permanent shift driven by necessity. While CLP was a logistical success during the Cold War, it struggles with the demands of modern suppressed weapons3. High temperatures and backpressures simply exceed what legacy fluids can handle3.
The industry is embracing specialized products, better oils, and permanent coatings to meet these new challenges19. By moving toward a future where we rely less on applied liquids, the mid-century concept of the “all-in-one” CLP is becoming obsolete61.
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