<https://columbiariverarms.com/product/22lbc-1x8-22-configurable/#product>
<http://schema.org/description>
"This barrel is available for additional custom configurations, including:\r\n\r\n&amp;nbsp;\r\n\r\n \tGas System Length\r\n \tProfile\r\n \tThreading Options\r\n \tFluting Options\r\n \tFinish Options \r\n\r\nTo continue, simply select your quantity and click \"Build Your Own”."
<https://columbiariverarms.com/product/22lbc-1x8-22-configurable/>