12-Gauge Shortgun: Mossberg’s Latest Dumpster Defender Transformed Into A Versatile SBS

Check out how RECOIL's Iain Harrison transformed the compact Mossberg 990 Aftershock into a dynamic short-barreled shotgun (SBS) in this month's RECOIL COVER GUN video.. Built on the proven 940 Pro semi-auto platform, this 12‑gauge, 14.75‑inch barrel firearm delivers reliability, speed, and serious versatility. With a 5+1 capacity, nickel‑boron‑plated gas system, oversized controls, high‑visibility follower, and beveled loading port, the Aftershock boasts both durability and user-friendly ergonomics. As usual, our RECOIL team took it further... folding the stock, installing an AR‑15 pistol grip, mounting a red‑dot optic, and adding tactical accessories via M-LOK rail attachments. The result: a compact, versatile SBS that’s rugged yet fun to shoot, ready for close‑quarters and field use. "The 990 Shockwave is a good place to start for a versatile SBS build. It’s not perfect, but if you can live with its shortcomings (or address them — this one’s headed to a ’smith to be threaded for choke tubes), then it’s probably the best platform on the market right now. As they’re selling every one they can make, don’t expect Mossberg to bring out the choked, rotary safety version anytime soon, but when they do, it’ll check every box we have." This Cover Guns video is brought to you by ‪@DeadAirSilencers‬ go check them out and support the brands that support our industry!