Understanding the "Corrosive" AK Ammo Phenomenon
If you've spent any time around firearms, particularly those of Eastern Bloc origin like the ubiquitous AK-47 and its many variants, you've likely heard the term "corrosive ammo." It's a phrase that can send a shiver down the spine of a new shooter, conjuring images of rusting barrels and ruined firearms. But what's the real story behind this persistent notion? Is AK ammo inherently corrosive, or is there more to the tale?
The short answer is: not all AK ammo is corrosive, but a significant amount of older, surplus ammunition designed for these platforms *is* corrosive. This isn't a design flaw of the AK rifle itself, but rather a consequence of the historical context and the ammunition's manufacturing. To understand why, we need to delve into the history and chemistry of ammunition primers.
The Role of the Primer
Every cartridge needs a primer to ignite the gunpowder. This tiny component contains a sensitive explosive compound that detonates when struck by the firing pin. For decades, many countries, particularly those in the Soviet Union and its allies, used primers that contained potassium chlorate as a key ingredient.
Potassium chlorate is a powerful oxidizer. When it detonates, it produces a hot, rapid flame. However, a byproduct of this combustion is hydrochloric acid (HCl). Now, hydrochloric acid is highly corrosive. In its gaseous form, it can react with moisture in the air and in the firearm's bore to create a highly acidic environment.
Why Was Corrosive Ammo Used?
There are several reasons why corrosive primers were prevalent, especially in military ammunition:
- Reliability in Harsh Conditions: Corrosive primers were incredibly reliable. They would ignite consistently even in extreme temperatures, damp environments, or after prolonged storage. This was paramount for military equipment where a misfire could be disastrous.
- Cost and Availability: The components used in these primers, like potassium chlorate, were relatively inexpensive and readily available to Soviet-era manufacturers.
- Simplicity of Manufacturing: The manufacturing processes for these primers were straightforward and could be scaled up to produce vast quantities of ammunition.
Essentially, for military applications where mass production, cost-effectiveness, and unfailing ignition were top priorities, the benefits of corrosive primers outweighed the drawbacks. The expectation was that military firearms would be properly cleaned and maintained by trained personnel.
The "Corrosive" Effect on Your Firearm
If you fire corrosive ammunition and don't clean your firearm properly afterward, that hydrochloric acid can start to eat away at the metal components, particularly the bore of your rifle. This can lead to:
- Rust and Pitting: The acid attacks the steel, causing rust and eventually pitting of the bore's surface. This can degrade accuracy over time.
- Increased Wear: The corrosive residues can accelerate wear on the moving parts of your firearm.
Identifying Corrosive Ammunition
How can you tell if your AK ammo might be corrosive? It's not always an exact science, but here are some common indicators:
- Origin: Ammunition manufactured in countries like Russia, China, Yugoslavia, Romania, East Germany, Poland, and Czechoslovakia during the Soviet era is often corrosive.
- Headstamp Markings: Some headstamps are more commonly associated with corrosive ammo. For example, headstamps like "7.62x39" with a "02" or "21" in a circle (Russian), "Norinco" (Chinese), or "11" (Yugoslavian) are frequently corrosive. However, not every piece with these markings is guaranteed to be, and vice-versa.
- No "Non-Corrosive" Marking: If the box or the casing itself doesn't explicitly state "non-corrosive" or "NC," it's a good idea to err on the side of caution and assume it *could* be corrosive, especially if it's older surplus.
- The "Water Test" (with caution): Some people perform a "water test" on the powder from a fired case. If you add a drop of water to the residue and it doesn't immediately fizz or react, it's less likely to be corrosive. However, this is not a foolproof method and is generally discouraged as a primary means of identification.
The Proper Cleaning Procedure for Corrosive Ammo
The good news is that dealing with corrosive ammo is straightforward once you know what to do. The key is to neutralize the corrosive residue. Here's the recommended cleaning procedure:
- Immediate Cleaning is Best: While not strictly necessary immediately after firing, it's highly recommended to clean your firearm as soon as possible after shooting corrosive ammo.
- Use Windex or a Similar Ammonia-Based Cleaner: This is the most effective way to neutralize the corrosive salts. Ammonia is an alkaline substance that reacts with and breaks down the acidic residue left by potassium chlorate. Spray Windex (or a dedicated bore cleaner with ammonia) liberally down the barrel. Let it sit for a few minutes.
- Scrub the Bore: Use a bronze or nylon bore brush to scrub the barrel thoroughly. You'll likely see some gunk and residue come out.
- Patch Out the Bore: Use clean patches to run through the bore until they come out clean. You may need to repeat the Windex and scrubbing process.
- Follow Up with Standard Cleaning: Once the corrosive residue is neutralized and removed, clean the rest of your firearm as you normally would with your preferred gun oil and solvent. Ensure all metal parts are properly lubricated and protected.
- Clean the Gas System: Don't forget to clean the gas tube and gas piston, as corrosive residue can build up there as well.
"The myth that AK ammo is inherently corrosive is a common misconception. While much of the older surplus ammunition designed for these rifles does indeed use corrosive primers, modern production ammunition for AK platforms is almost exclusively non-corrosive."
Modern Ammunition and the AK
Today, the vast majority of commercially produced ammunition, including that specifically made for AK-pattern rifles (like 7.62x39mm and 5.45x39mm), uses non-corrosive primers. These primers typically contain compounds like:
- Lead styphnate
- Diazodinitrophenol (DDNP)
- Lead free alternatives
These compounds are designed to be sensitive and reliable without leaving behind corrosive byproducts. This means that if you buy new production ammunition from reputable manufacturers like Wolf, Tula, Barnaul, or any major American ammunition company, you generally don't need to worry about corrosive residues.
So, while the "corrosive AK ammo" concern is rooted in a real historical fact, it's largely a relic of the past for most shooters. The key is to be aware of the ammunition you're using, especially if it's surplus, and to follow proper cleaning procedures. With a little diligence, your AK-pattern rifle will remain in excellent condition for years to come.
Frequently Asked Questions (FAQ)
How do I know if my AK ammo is corrosive?
Look for ammunition manufactured in former Soviet Bloc countries from the Soviet era. Common indicators include specific headstamps (e.g., "02" or "21" Russian, "Norinco" Chinese, "11" Yugoslavian) and the absence of a "non-corrosive" marking. If in doubt, especially with older surplus, treat it as potentially corrosive.
Why is it important to clean AK ammo that is corrosive?
Corrosive primers leave behind acidic residue (primarily hydrochloric acid) that can damage the bore of your firearm by causing rust and pitting. This can degrade accuracy and the longevity of your rifle's barrel if not properly neutralized and cleaned.
What is the best way to clean corrosive AK ammo residue?
The most effective method is to use an ammonia-based cleaner like Windex. Spray it liberally down the barrel, let it sit, scrub with a bore brush, and then patch out until clean. This neutralizes the corrosive salts. Afterward, clean and lubricate your firearm as usual.
Is all AK-pattern rifle ammunition corrosive?
No, only older surplus ammunition from specific countries and eras is typically corrosive. Modern production ammunition for AK-pattern rifles, made by reputable manufacturers worldwide, almost universally uses non-corrosive primers.
Will shooting corrosive ammo ruin my AK?
No, shooting corrosive ammo will not ruin your AK if you follow the correct cleaning procedures. The damage occurs from neglecting to clean the corrosive residue promptly. Proper and immediate cleaning after firing corrosive ammunition will prevent any long-term harm.
