This is the new, redisgned 12g knob for the CCM SSR and SSPAR first strike rifles.  The new 12g knob has a 4-lead thread allowing for quicker thread engagement.  Not compatible with the CCM SR1.

   CCM products are designed and manufactured in the United States and are machined from high quality materials such as 6061 air craft grade aluminum, 300 series stainless steel, and durable plastics such as delrin and lexan.
MADE IN THE USA