The AR180B Lower Completion kit along with your standard AR15 lower parts kit will allow you to populate the Nodak NDS-18S lower receiver. These kits are also great as spares for you AR180B rifle.
Bolt hold open, pivot and clip as well as the safety and the safety retaining spring.
$130 shipped in the CONUS Email me through the contact form and I can send you my mailing address. USPS Money Order preferred, other options available if prior arrangements are made.