AK Failure to Feed

Causes & Diagnosis

Magazine problems, ammunition, short recoil, chamber fouling, recoil springs, carrier movement, feed presentation, locking problems, and the diagnostic order that makes sense before you start replacing parts.

Magazines   |   Ammunition   |   Chambering   |   Cycling   |   Lockup   |   Diagnosis

“Failure to feed” is one of those phrases people use for several different malfunctions.

The bolt can fail to pick up a cartridge. A round can start feeding and stop before reaching the chamber. A cartridge can enter the chamber but fail to seat fully. The bolt can reach the front and still fail to rotate into lock. A spent case can remain in the action and collide with the next live round.

Shooters regularly call all of those “FTF.”

That makes diagnosis harder than it needs to be. The first job is not fixing the rifle. The first job is correctly identifying what the rifle failed to do.

Don't diagnose “failure to feed.” Diagnose the exact point where the cycle stopped.

A dirty magazine can cause a true feed failure. A dirty chamber can cause failure to chamber. Fouling around the locking surfaces can cause failure to lock. Short recoil can prevent the carrier from traveling far enough rearward to pick up the next round. Those are different problems even if the shooter experiences all of them as “gun didn't load the next round.”

The official AK operator manual starts its failure-to-feed list with magazine seating and magazine condition. That lines up perfectly with how we troubleshoot in practice.

If Magazine #3 fails twice while Magazines #1, #2 and #4 run fine with the same rifle and ammunition, that is useful information.

Zastava's current magazine guidance focuses on the same physical areas:

• Magazine body for dents, cracks or deformation.
• Feed lips for cracks, bends, spreading or asymmetry.
• Follower for smooth movement.
• Spring for useful, consistent tension.
• Front and rear locking areas for damage or abnormal wear.

Some AK magazine movement is not automatically a malfunction.

What matters more is whether the magazine locks securely, remains retained, sits at a usable height, presents cartridges consistently and releases normally.

A magazine that is slightly loose but feeds thousands of rounds is less interesting than a magazine that appears beautifully tight but consistently sits low enough for the bolt to skip the top cartridge.

A fully loaded magazine can require noticeably more force to lock into some AK configurations with the bolt forward because the top round has to push down against an already highly compressed magazine spring. Compare loaded and unloaded seating before treating increased resistance as proof of bad fitment.

The Marine Corps AK manual lists dirty or corroded ammunition as a direct feed-failure cause and damaged ammunition as a chambering cause.

Inspect malfunctioned cartridges instead of immediately tossing them back into the magazine.

Look for:

• Heavy corrosion.
• Case deformation.
• Loose or visibly displaced projectile.
• Deep damage produced during the stoppage.
• Foreign material stuck to the cartridge.
• Repeated problems with one ammunition type or lot.

Two cartridges can use the same caliber and still present differently as they leave the magazine and enter the chamber.

Nose shape, cartridge length and exact round position in the magazine all influence the path forward.

If one unusual projectile profile repeatedly hangs up while normal factory ball ammunition runs perfectly across known-good magazines, that ammunition relationship deserves attention. If several normal loads all fail in the same place, the rifle deserves more of it.

The carrier has to travel far enough rearward to get behind the next cartridge.

If the carrier does not travel far enough, it may return forward without correctly stripping the next round.

The Marine Corps organizational maintenance manual explicitly lists short recoil as a failure-to-feed cause.

Its short-recoil troubleshooting includes:

• Defective recoil-spring / guide assembly.
• Dirty gas-system components.
• Dirty carrier assembly.
• Excessive gas leakage.

Adjustable pistons and regulated gas systems can make a harsh or suppressed AK run much more cleanly.

They can also reduce operating margin.

If a rifle ran properly before a gas adjustment and suddenly starts failing to pick up cartridges after the adjustment, put the gas setting back near the manufacturer's known reliable baseline before blaming the magazine, chamber and recoil spring simultaneously.

One configuration change immediately followed by one new malfunction is not proof, but it's a damn good clue.

This is where people often keep blaming the magazine long after the magazine has done its job.

If the cartridge is clearly being stripped from the magazine and reaches the chamber but will not fully seat, start thinking about:

• Dirty or damaged ammunition.
• Carbon or contamination in the chamber.
• Burrs or mechanical interference.
• Carrier/bolt movement being restricted.
• Forward-drive problems from the recoil assembly.

The AK uses a rotating bolt. Feeding the cartridge is not the final step.

The bolt still has to rotate into the locking recesses correctly.

Official troubleshooting material lists dirt, corrosion or carbon around the locking surfaces as possible causes of failure to lock. It also identifies receiver damage as a problem that belongs at the armorer level rather than in a kitchen-table tuning session.

If a fired case remains in the chamber or receiver while the carrier tries to bring the next live cartridge forward, the resulting stoppage may look like a feed jam.

But the magazine may have done everything correctly.

Zastava's current extractor/ejector guidance treats extractor condition, extractor-spring condition, debris around the extractor and ejector condition as separate mechanical checks.

If a spent case is still involved in the stoppage, make a note of that. Your diagnosis may need to move from feeding toward extraction/ejection.

We covered this in the magazine guide, but it matters too much here to skip.

5.56 AK rifles do not all share one universal magazine standard.

Before chasing feed geometry on a 5.56 AK, confirm that the magazine is actually intended for that rifle family.

Wrong-pattern magazine + almost-fitting lockup = a very convincing fake rifle problem.

Aftermarket parts are not automatically the problem.

But when a rifle runs correctly for 2,000 rounds, gets modified on Saturday, and starts choking on Sunday, the change belongs near the top of the diagnostic list.

Relevant changes can include:

• Adjustable gas piston or regulator.
• Recoil-spring change.
• Suppressor addition/removal.
• Magazine or mag-catch changes.
• Bolt/carrier work.
• Receiver or magazine-well modification.
• Caliber / magazine conversion components.

Don't just count malfunctions. Pay attention to when they occur.

1. Document the stoppage before disturbing it.
   Note cartridge position, bolt position, magazine number, ammunition and whether a fired case is still present.
2. Confirm the magazine is correct for the rifle and fully locked.
3. Try a known-good compatible magazine.
4. Inspect the suspect magazine.
   Feed lips, follower, spring, body and locking surfaces.
5. Try known-good factory ammunition of the correct caliber.
6. Inspect and clean the chamber, bolt/carrier and gas system.
7. Inspect the recoil-spring assembly and carrier movement.
8. Consider short recoil.
   Is the carrier actually traveling far enough rearward to get behind the next cartridge?
9. Return recent modifications toward a known-good baseline.
10. If several good magazines and ammunition types produce the same repeatable mechanical failure, stop treating it like a magazine problem.

If you swap the magazine, ammunition, recoil spring and gas setting at the same time and the rifle starts working, congratulations — you fixed something and learned almost nothing.

Removing metal is easy. Putting it back is surprisingly inconvenient.

Before polishing, filing, grinding or changing the geometry of a feed or locking surface, prove that the surface is actually defective. Magazine fit, ammunition, fouling and cycling problems can create feed stoppages without requiring permanent modification to the rifle.

If a cartridge repeatedly will not chamber or the bolt will not lock, clear the rifle and identify why. A rifle that requires repeated force to close is telling you something. Listen before you turn a correctable obstruction or damaged cartridge into a larger mechanical problem.

Some failures belong beyond magazine swapping and routine maintenance.

Stop and get the rifle properly inspected when you find:

• Cracked or visibly damaged locking components.
• Receiver deformation.
• Bolt or carrier binding caused by obvious mechanical damage.
• Repeated failure to lock with clean, correct ammunition.
• Abnormal headspace concerns.
• Damage that appears to be getting progressively worse.
• A rifle that still exhibits the same mechanical failure after the easy variables have been properly isolated.

Failure to feed is not one problem.

Start with the magazine because it is easy to isolate. Confirm the ammunition. Look at what the round actually did. Determine whether the carrier traveled far enough. Separate feed, chambering and locking problems instead of lumping them together.

Then let the pattern lead you.

One malfunction gives you a clue. A repeatable malfunction that follows one magazine, ammunition type, configuration or mechanical condition gives you a diagnosis worth chasing.

• U.S. Marine Corps — AK-47 Operator's Manual, TM 8370-50007-OR/1
  Failure-to-feed, double-feed, failure-to-chamber, failure-to-lock and short-recoil troubleshooting.
• U.S. Marine Corps — AK-47 Organizational Maintenance Manual, TM 8370-50007-IN/2
  Magazine condition, short recoil, recoil-spring, chamber, bolt, gas-system and mechanical troubleshooting.
• Zastava Arms USA — AK Magazine Reliability Checklist
  Springs, followers, feed lips and magazine-body condition.
• Zastava Arms USA — How to Maintain Zastava Magazines
  Follower travel, feed-lip condition, magazine cleanliness and damaged-magazine comparison.
• Zastava Arms USA — Field Repairs on Zastava AKs
  Magazine checks before deeper mechanical repair and factory-spec service-part guidance.
• Zastava Arms USA — Extractor and Ejector Checks on Zastava AKs
  Separating extraction/ejection failures from apparent feed stoppages.
• Zastava Arms USA — How to Mark and Rotate AK Magazines
  Identifying repeatable magazine-specific failures instead of relying on memory.
• Palmetto State Armory — Current AK Owner's Manual
  Traditional rock-and-lock magazine insertion, loaded-magazine seating behavior and correct ammunition guidance.

Research reviewed October 1, 2026. Exact magazine, chamber, gas-system and recoil-system specifications vary across AK-pattern rifles. Use the current manual and manufacturer documentation for the exact rifle as the factory baseline.

IRONKELLS ARMORY | AK FORGE FILES

Find Where the Cycle Stopped.

Magazine. Ammo. Carrier travel. Chamber. Lockup. Follow the evidence instead of replacing half the rifle.