Marlin Model 60 / 99C / 990 Inside Magazine Tube — Replacement Inner Tube Assembly | 507522
Restore smooth, reliable feeding in your classic tube-fed .22 with the Marlin 60 / 99C / 990 Inside Magazine Tube (Part #507522). Built as a direct-fit inner magazine tube assembly, this replacement unit refreshes worn springs and followers so your rifle loads, feeds, and locks in the way Marlin intended. If you’re chasing rimfire accuracy, eliminating misfeeds, or bringing a well-loved rifle back to life, replacing the inner tube is one of the most impactful—and affordable—upgrades you can make.
Why This Inside Magazine Tube Is a Smart Upgrade
Direct fit for popular tube-fed Marlins: Designed for Marlin Model 60, 99C, and 990 rifles that use a tubular .22 LR magazine.
Feeds like new: A fresh spring and follower restore proper stack tension and alignment to help reduce nose-dives, weak feeding, and last-round issues.
Smooth loading & lockup: Correct overall length and guide geometry support easy top-off and positive lock when inserting the tube into the outer magazine.
Rimfire-ready materials: Inner tube, follower, and cap are made to handle constant use, cleaning solvents, and range conditions.
Fast, simple install: Drops in with basic field handling—no gunsmith required for standard replacement.
Compatibility Tip: Marlin produced the Model 60 family for decades. Minor variations exist by year. If your outer magazine tube length or front-cap style differs from current production, measure your original inner tube before ordering to confirm match.
Key Features at a Glance
Application: Inside (inner) magazine tube assembly for Marlin Model 60 / 99C / 990
Caliber: .22 Long Rifle (.22 LR)
Components: Inner tube with attached follower, spring, and cap (assembly style may vary by batch)
Function: Replaces worn/damaged inner tube to restore reliable feeding and proper magazine tension
Part Number: 507522
Performance Benefits You’ll Notice
Fewer stoppages: Fresh spring tension helps avoid sluggish feeding and erratic last-round behavior.
Better user experience: Smoother loading, positive lock when seated, and consistent feel during range sessions.
Confidence in the field: Reliable magazine function keeps your classic Marlin ready for plinking, small-game hunts, and casual steel.
Fits These Models
Marlin Model 60 (tube-fed .22 LR variants)
Marlin 99C (tube-fed .22 LR)
Marlin 990 (tube-fed .22 LR)
Note: Does not fit detachable-magazine Marlin rifles. Some early/rare production runs may require a different inner tube length. Always compare your old inner tube to confirm.
Installation (Quick Guide)
Unload completely. Open the action, visually/physically check chamber and tube—no ammo present.
Remove old inner tube. Rotate the locking cap and withdraw the inner tube from the outer magazine.
Inspect the outer tube. Ensure it’s clean, straight, and free of burrs or dents.
Insert the new inner tube. Compress the follower/spring as you slide the inner tube in; align and rotate the cap to lock.
Function check. Load a few dummy .22 LR rounds or test at the range to verify smooth feeding and positive lock.
If you feel unusual resistance, stop and inspect for debris or a dented outer magazine tube—inner tube replacement can’t compensate for severe outer-tube damage.
Care & Maintenance
Keep it clean: Wipe the inner tube with a lightly oiled cloth after range trips; avoid heavy oil in cold weather.
Inspect the spring: Replace if you feel weak tension or see corrosion.
Mind your ammo: Use quality .22 LR; avoid waxy buildup by cleaning the tube periodically.
Store unloaded: Relieves constant spring compression for maximum service life.
Troubleshooting Tips
Won’t fully seat/lock: Check for debris or a dent in the outer tube; confirm inner tube length matches your original.
Intermittent feeding: Verify follower movement is free and spring tension is adequate; clean both tubes and try different ammo.
Last-round hang-ups: Inspect feed throat and lifter; a fresh inner tube often helps, but accumulated fouling can also be the cause.
Specifications
Product Type: Inside magazine tube (inner tube assembly)
For Rifles: Marlin 60 / 99C / 990 (tube-fed .22 LR)
Includes: Inner tube with follower, spring, cap (assembly may vary)
Caliber: .22 LR
Part #: 507522
Frequently Asked Questions
Q: Will this fit my Glenfield-marked Model 60?
A: Most Glenfield by Marlin Model 60 rifles share the same tube system. Compare the inner tube length and cap style to confirm.
Q: Does this include the outer magazine tube?
A: No—this is the inner tube assembly only. The outer tube remains attached to the barrel/forend.
Q: My rifle is older—how can I be sure it fits?
A: Measure your original inner tube’s overall length and compare to the replacement. If your rifle has a unique front cap or shorter barrel/mag length, you may need a different variant.
Q: Can I run .22 Short or .22 Long?
A: The Model 60 family is optimized for .22 LR. Use the ammunition specified by your rifle’s barrel markings and owner’s manual.
Q: Do I need a gunsmith to install it?
A: Most owners can install the inner tube in minutes. If the outer tube is dented or misaligned, consult a qualified gunsmith.
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Bring dependable feeding back to your rimfire classic. The Marlin 60/99C/990 Inside Magazine Tube (507522) replaces worn internals so your tube-fed .22 runs smoothly—on the bench, in the woods, and for years to come.
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