Wildcat mk2 compact and slugs

I just put the slug liner in mine and have only had time to test it out a little bit with VK 31g. Factory reg and hammer spring they are at just under 800 FPS. Accuracy is just slightly better than with the pellet liner. I should have ordered a Huma reg the same day as the liner but haven’t yet. Maybe get a chance to play with it again tomorrow and will see what I can get out of the hammer spring.