Ultra-compact and easy to maneuver, the 990 AfterShock SPX features optic ready receiver; Enlarged and beveled loading port for ease of reloading; magazine tube extension with M-LOK mounting slots for easy accessory customization; front Fiber Optic sight equipped with low-profile protective wings; forend features an integrated heat shield, multiple M-LOK accessory slots and QD ports. Includes Cylinder Bore choke installed, three additional adapter plates for mounting RMR, Docter and Leupold footprint optics.
Brand Mossberg
Category Tactical Shotguns
Series Aftershock SPX
Model 990
Barrel Length Range 18" to 18.99"
Operating System Gas
Stock Finish Group Black
Capacity 7+1
Action Semi-Auto
Oal 30.88"
Sights Fiber Optic Front
Mount Type Shield RMSc Footprint
Chamber 3"
Barrel Finish Matte Black
Barrel Material Steel
Receiver Description Drilled & Tapped
Choke Configuration Accu-Choke
Grips Black Polymer
Application Home Defense
Chokes Included Cylinder Bore
Barrel Description Integrated Heat Shield
Barrel Length 18.50"
Max Capacity 7
Receiver Finish Matte Black
Caliber Dictionary
The Below Information Has Been Provided From Our Gun Caliber Dictionary And Is Meant For Informational Purposes Only. It Is Not Intended to Describe The Unique Specifications For This Ammunition.
12 gauge is the most popular and useful shotgun gauges ever made. Suitable for everything from doves to geese. With sporting, military and law enforcement applications. Available in 2 ¾”, 3” and 3 ½”. The magnum lengths are generally preferred for waterfowl and turkey. Most major manufacturers produce guns and ammunition in a very wide septum for 12 gauge. Loads from ¾ oz. to 2 oz. are common with 1 1/8 oz Low base and 1 ¼ oz being the most common loadings. Target loads are normally around 1150 to 1200 FPS with High velocity lead loads tuning up 1350 FPS. Steel waterfowl loads tend to be loaded faster around 1500 FPS to compensate lower density shot. While the 2 ¾” loading is still the most popular ammunition made, nearly all current production guns have 3”or 3 ½” chambers. The shorter ammunition can be safely fired in longer chambers, but not all magnum semiautomatics will function with shorter shotshells. — Craig Boddington
