Armalite ~ SPR (Special Purpose Rifle) MOD 1 ~ 5.56 NATO

The ArmaLite SPR Mod 1 (Special Purpose Rifle) is a semi-automatic tactical rifle built on the M-15 (AR-15) platform and chambered in .223 Remington/5.56x45mm NATO (often featuring a .223 Wylde chamber). Originally introduced around 2010, its defining characteristic is its unique monolithic upper receiver assembly.