Darren unboxes a .410 Upper from USA, LLC. and demonstrates how to properly dismantle and rebuild it when cleaning.
You can purchase a .410 Upper from USA, LLC. here.
United Sporting Arms, LLC. | .410 Upper – Unboxing & Cleaning Guide
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You don’t take apart the bolt carrier group when cleaning? My 410 upper didn’t come with a book and I don’t see a cotter pin in the bolt carrier group, so not sure how deeply this needs cleaned, aside from what you just showed, and bore snaking it.