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U.S. Military New Surplus M-16 M4 Heavy Duty Castle Nut  Fits Ar-15  (Milspec Rust Resistance)

U.S. Military New Surplus M-16 M4 Heavy Duty Castle Nut Fits Ar-15 (Milspec Rust Resistance)

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On sale $5.49
Retail Price:$14.99
Your Savings:$9.50(63%)
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Part Number:4019
U.S. Military AR-15 Heavy Duty Wide Castle Nut

Slightly Wider & Stronger, More Durable Hold Steel Fits Mil-spec/Commercial Buffer Tubes. Great simple but effective upgrade for your AR-15.
Passes military 9 hour salt spray test for corrosion. We put a regular one & this one in a salt bath to show employees overnight the military one zero rust the us made regular nut was severely pitted & ruined.  So there is a finish difference this nut is lighter in color a light grey to green color 

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