It’s workable, but not terribly convenient for switching shell lengths on the fly. The wedge has to be removed from the receiver in order to fire 2¾" or 3" shells. I've tested it and it works nicely, but only with mini shells. It's a wedge-shaped rubber block that is pressed into the rear of the elevator port to act as a buffer.
#Mossberg shockwave buckshot vs slug series#
OPSol Texas offers a fix for this feeding issue for Mossberg 500 and 590 series models called the Mini-Clip.
This means they’re not always in proper alignment with the chamber as the action is cycled which may cause the shell to jam during its transition up into the chamber. But the shells don’t feed reliably in standard pump actions because abbreviated hulls tend to rattle around in the shell elevator port. The range test of the original 590 Shockwave included Aguila Ammunition's Mini Shell buckshot load, which was more manageable than bigger shells and produced solid pattern results at close range. The new 590S 20” barrel tactical shotgun (Top) and 590S Shockwave. They have slightly lighter payloads and reduced velocity powder charges resulting in noticeably reduced felt recoil. The Shockwave's tubular magazine can hold 4+1 rounds of 3" shells, 5+1 rounds of 2¾" shells or 8+1 of rounds 1¾" shells.
They can be reliably fired and ejected from pump actions with 2¾" or 3" chambers and their reduced overall length allows additional rounds to fit into the magazine. That brings us back to one more ammunition option for the 12-ga. fitted with a 10-round removable box magazines. These boxy magazines are limited to 2¾" shells only and they infringe on the slim, sleek profile of the Shockwave.
But the magazines are a bit weighty, fairly bulky and relatively expensive with prices ranging from $80 to $113. The system is reliable and those who like it, really like it. This version of the Shockwave accepts ruggedly built, double-stack magazines that hold 5-, 10-, 15- or 20-rounds. In 2018 Mossberg introduced a removable box magazine fed version of the Shockwave as part of the 590M line up. version, these two models accept shells up to 3" in length which means the on-board round counts are the same as the 12-ga. 410 bore loads are less diverse and sometimes harder to find making these models less flexible than their 12-ga. In working with these models, I’ve found that they are definitely more manageable than the 12-ga. Mossberg soon addressed felt recoil by offering 590 Shockwave models chambered for 20-ga. This is especially true for those willing brave the fury of firing 3" cartridges from this platform. They include a reduced ammunition capacity and more challenging felt-recoil management. Reducing the barrel and magazine tube lengths of a pump-action 12-ga., along with replacing the shoulder stock with a pistol grip at the factory, makes these guns quite handy but the modifications come with some notable trade-offs. But the Shockwave exhibited that just-right balance of features and brand recognition to drive sales and inspire several similarly sized models from other manufacturers. A few smaller companies had already released their own factory produced versions. Non-NFA firearms, meaning scatter guns with barrels shorter than 16", have been legally plausible for some time. Mossberg's aptly named 590 Shockwave caused more than just a blip on the shooting market's seismograph when it launched in 2017.
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