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  1. SIG Sauer Rifles
    Had a couple questions regarding the MPX foregrip: 1. Is it legal to attach a foregrip to the MPX or do I need get ATF stamp? I plan to SBR it but in the meantime, was curious if I can legally do this. 2. Ordered a foregrip off eBAy that should fit the Picatinny 1913 rail and the foregrip was...
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