Solid Film Lubricant (SFL) is the only authorized touchup for the M16A2 rifle and M4/M4A1 carbines and may be used on up to one third of the exterior finish of the weapon. FOR ARMY CONUS USE ONLY AND AIR FORCE TRAINING WEAPONS ONLY: SFL may be used as touchup without limitation on the upper receiver and barrel assembly. This is to say that units which DO NOT fall under the category of Divisional Combat Units or rapid deployment type units may have up to 100 percent of the exterior surface of the upper receiver and barrel assembly protected with SFL if necessary.


This task covers:

a Disassembly

d Test

b Cleaning

e Repair

c Inspection

f Reassembly


Test Equipment


Tool and Gage Set (item 2, app B)

Cleaner, lubricant, and preservative (CLP)

(item 9, app D)


Cleaning compound, rifle bore (RBC)

(ARMY) Small Arms Repairman Tool Kit

(item 12, app D)

(item 3, app B)

Pipe cleaner (item 11, app D)

Equipment Conditions

3-1 5 Bolt carrier assembly removed


Clean carrier key and gas relief ports using CLP or RBC and pipe cleaner

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