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Am thinking about building a 22lr AR-15 the only parts I lack are these. Anyone have any experience with them?
http://www.midwayusa.com/product/17...ur-1-in-16-twist-16-chrome-moly-matte-pre-ban
http://www.midwayusa.com/product/17...ur-1-in-16-twist-16-chrome-moly-matte-pre-ban