The Mossberg 990 AfterShock SPX is a compact semi-automatic 12 gauge firearm built specifically for defensive, tactical & close-quarters applications. Based on Mossberg’s new 990 gas-operated platform, the AfterShock SPX combines fast semi-auto cycling with the compact “firearm” configuration popularized by the Shockwave series. The SPX model adds several tactical upgrades including an optic-ready receiver with Shield RMSc footprint, integrated heat shield, enlarged controls, M-LOK compatible forend, QD sling attachment points, winged fiber optic front sight & the signature AfterShock grip designed to reduce felt recoil while improving control. Offered in both 14.75" & 18.5" barrel variants, the 990 AfterShock SPX is intended for home defense, vehicle deployment, tactical use & enthusiasts seeking a highly maneuverable semi-auto platform. Mossberg has maintained a strong reputation for producing rugged defensive shotguns trusted by military, law enforcement and civilian users for decades & the 990 AfterShock SPX continues that legacy with a refined gas system & upgraded ergonomics derived from the proven 940 series. Reviews consistently praise the platform’s controllability, fast cycling reliability, oversized tactical controls & reduced recoil compared to pump-action firearms in similar configurations. The enlarged loading port, corrosion-resistant internals, nickel-boron treated components & durable finish options improve long-term reliability under hard use, while the compact dimensions make the firearm exceptionally maneuverable indoors or in confined environments. For shooters seeking a modern tactical semi-auto firearm that blends compact handling with substantial firepower, the 990 AfterShock SPX delivers impressive overall performance & premium build quality.