BudsGunShop.com - legality
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Adding this kit to a shockwave would this be a nfa?
3 Answers

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Andre, This kit is not legal on a Shockwave.
I would say no as other companies such as Remington offer a setup from the factory very similar to what you are looking at making: remington.com/other-products/model-870-tac-14-arm-brace
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Andre, this is a Brace and not a stock so is perfectly legal on the 590 Shockwave : google.com/search?q=shockwave+sbm4&sxsrf=ACYBGNR1wORvU-U76Ja-Dp8v6WCu38cPVA:1578513590437&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjdytKu5fTmAhWFTt8KHZWYDa4Q_AUoAnoECA8QBA&biw=1920&bih=966#imgrc=7ytOhGCd7aYtlM: