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Mossberg 590 Sidewinder Magazine Conversion Kit
For sale is one BNIB Mossberg 590 Adaptive Tactical Sidewinder kit, cost is $300 OBO plus $25 shipping. This one comes with a 10-round drum magazine, Canada legal since it's specifically for and will only fit in a manual-action shotgun.
FAB Defense SLA Picatinny Sling Adapter
I've got a FAB Defense SLA sling picatinny attachment available, cost is $15 firm plus $15 for shipping. Plain and simple, this aluminum adapter clamps onto a picatinny rail and lets you attach any sling 1" or smaller in diameter.