Ruger AR-556 5.56 NATO Custom AR-15, 20 inch Barrel, Davidson Defense Upper, Fostech Echo AR-II Binary Trigger, Free-Float M-LOK, Flip-Up Sights
This AR-15 pairs a Ruger AR-556 serialized lower (Mayodan, NC; 2018) with a Davidson Defense upper for a purpose-built 5.56 NATO setup. It features a 20 inch threaded barrel with an A2-style birdcage flash hider, a free-float M-LOK handguard, and flip-up backup iron sights. A Fostech Echo AR-II binary trigger is installed, and the rifle wears Mission First Tactical furniture in tan. Capacity is 30+1, and it includes two PMAGs and a sling.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: There are scratches and blemishes present. The bore is clean and shiny. The trigger shoe shows pitting.
What’s Included
- Ruger AR-556 rifle as described
- 2x Magpul PMAG Gen M2 30-round magazines
- Sling
- Mission First Tactical adjustable carbine stock (installed)
- Mission First Tactical RSG vertical foregrip (installed)
- Flip-up front and rear backup iron sights (installed)
- Fixed metal sling loop installed on the handguard at the 12 o'clock M-LOK slot
The foundation is a Ruger AR-556 serialized lower marked "RUGER MAYODAN, NC USA," manufactured in 2018, mated to a Davidson Defense upper receiver assembly. The barrel is marked "5.56," measures 20 inches, and is threaded with an A2-style birdcage flash hider. The system runs direct impingement for a classic AR-15 operating setup.
A free-float M-LOK handguard with a partial top Picatinny rail covers a low-profile gas system. The handguard includes a fixed metal sling loop positioned at 12 o'clock. Flip-up front and rear backup iron sights are installed for immediate use.
Fire control is handled by the Fostech Echo AR-II binary trigger, paired with a manual safety selector. Please make sure to verify legality of binary triggers in your location before purchase.
Ergonomics are enhanced with a Mission First Tactical 6-position adjustable carbine stock in tan (length of pull stated as 11–14 inches) and an MFT RSG vertical foregrip in tan. A textured polymer pistol grip provides a secure hold. Capacity is stated as 30+1, and the rifle is finished in matte black with tan furniture accents. Made in the USA.