The Masterpiece Arms R556 is a semi automatic sporting rifle chambered in 5.56mm NATO and features a 16.25" barrel, combat muzzle brake and full length rail. It features a locked bolt short stroke piston system, MPA aluminum handguard, non-reciprocating side charger with forward assist. The MPAR 556 also has a side folding collapsible buttstock and will accept any standard pattern AR-15 magazines.
- 5.56mm NATO (accepts .223 Remington)
- 16" Barrel
- 1:9" Twist rate
- Muzzle brake
- Short stroke piston design
- Non-reciprocating side charger with forward assist
- MPA side folding collapsible buttstock
- MPA aluminum handguard
- Full length top rail
- Overall weight 7.8 lbs.
- Black phosphate, hardcoat black
- Anodized finish