Conversion kit?

[Bullit]

The Knight MK 85 I recently acquired came with this extra breech plug and nipple. As well as another bolt assembly. When I install them the bolt will not reach the nipple to strike the cap. Are these parts not for this rifle?

 

[GM54-120]

The breech plug on the right is a Red Plastic Jacket plug that uses a 209 primer in a FPJ. Its NOT a percussion cap breech plug.

Its uses these. See how the 209 goes in the red FPJ? The other end goes on the plug sort of like how a percussion cap goes on a nipple.
https://www.muzzleloaders.com/product/full-plastic-jacket-209-muzzleloader-ignition-system/
https://www.muzzleloaders.com/product/easy-full-plastic-jacket-209-primer-loading-hand-tool/

 

[GM54-120]

https://www.muzzleloaders.com/product/209-primer-ignition-50-cal-muzzleloader-conversion-kit/

This kit converts muzzleloaders shooting No. 11 or musket caps to shoot 209 primers.
Fits: .50 cal LK, USAK, BH, TK2000, BK, MK85, and .54 cal models.

 

[Bullit]

Great information. Thanks for the quick response to my question.