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The new Shockwave 590M brings 10+1 rounds of 12 gauge to the party, with extra 5, 10, 15 and 20-round magazines always a possibility. (Photo: Mossberg)

The new non-NFA pump-action 12 gauge includes a 15-inch barrel and 10-shell detachable box magazine as standard options.

Announced Tuesday, the latest addition to Mossberg’s constantly growing Shockwave line is the 590M, blending the standard Raptor-gripped platform and its 27.5-inch overall length, with the company’s new series of detachable double-stack magazine offerings. While a single 10-shot magazine comes with the heavy-walled firearm, optional five, 10, 15 and 20-round capacity mags are sold as accessories.

The 590M features a safety strap on the corn cob fore-end along with sling swivel studs. Capable of holding 11 shells between the chamber and standard magazine, the newest Shockwave is billed as having a weight of 6.55-pounds, which is a full pound heavier than the standard model with its 6+1 capacity underbarrel tube mag.