Best all-in-one kit
Real Avid AR-15 Armorer's Master Kit
- ✓Covers 90% of armorer tasks in one case
- ✓Professional-grade upgraded punches and wrench heads
$89.99
Check Price at OpticsPlanet
AR-15 Maintenance Schedule (500 to 6,000 Rounds)
Align inspections with round-count milestones, not calendar dates. Round count determines wear; time on the shelf does not. If you track nothing else, track rounds fired and log every malfunction. For builders still assembling their first rifle, start with our build your first AR-15 guide before diving into maintenance intervals.
Every Range Trip
0-500 rounds- • Clean and lubricate bolt carrier group: cam pin, gas rings, extractor, bolt tail.
- • Inspect muzzle device and suppressor mounts for carbon buildup and torque drift.
- • Check optic mount witness marks and sling attachment hardware.
- • Wipe bore with BoreSnake or pull-through cleaner.
Tools needed
BoreSnake or Otis RipcordCLP or separate solvent + oilAP brush set
Log any malfunctions immediately after the session. A quick 10-minute cleaning after every trip prevents carbon from baking into the action.
Quarterly Inspection
1,500 rounds- • Stand-up test: gas rings should hold the carrier's weight on the extended bolt.
- • Measure action spring free length. Replace if below 10.0" (carbine) or 12.5" (rifle).
- • Inspect buffer face and carrier key for peening or stakingStaking[Components]Deforming metal screw threads (usually on the gas key) to prevent them from vibrating loose under recoil. Essential for reliability. walk-off.
- • Verify trigger pins are flush and not walking. Reapply threadlocker to grip screw if needed.
Tools needed
Calipers or rulerWheeler FAT WrenchLoctite 243 Blue
Swap weapon light batteries at this interval regardless of runtime. Confirm optic zero with a 3-round group.
Semi-Annual Inspection
3,000 rounds- • Headspace check with GO/NO-GO gauges using the fielded bolt.
- • Inspect barrel extension lugs and feed ramps for erosion or sharp edges.
- • Disassemble lower: clean detent channels, selector, and magazine catch.
- • Rotate magazines: mark training vs duty, retire any with dents or weak feed lips.
Tools needed
Headspace gauge setPunch setArmorer's wrenchBorescope (optional)
Document any parts replaced and reset the round count on the rifle data card. This is the interval where most preventive replacements pay off.
Annual Overhaul
6,000 rounds- • Replace extractor spring, insert, and O-ring. Install new gas rings.
- • Swap action spring and buffer detent spring regardless of appearance.
- • Inspect upper/lower receiver fit, takedown pin tension, and cam pin track for elongation.
- • Borescope barrel for throat erosionThroat Erosion[Barrel]Gradual wear at the chamber end of the barrel from hot propellant gases. Affects accuracy over thousands of rounds by changing the bullet's jump to the rifling.. Record measurement to track drift over time.
Tools needed
BorescopeReaction rod or vise blockComplete spring replacement kitTorque wrench
Schedule a function test with both suppressed and unsuppressed live fire using all duty ammo types. This is a full armorer-level service.
