G-SERIES 209 CONVERSION KIT= 2 pieces, breech-plug for 209 primer with retaining wire plus striker. Change-over is simple. Replace the Nipple breech-plug in your Whitetail, Bison or M97 Whitetail Hunter with this new 209 breech-plug, replace the #11 cap hammer with this 209 striker. 209 primers give you the advantage of more and hotter fire to light the newer black powder substitute powders like PyrodeP, 777 and Blackhorn 209. $110 plus $10 for USPS Priority insured.