all you with an 04 viking will know the prob with small bore paint rolling behind the eye's ok i know that aka will update your bolt (put a slot in it and give you stiffer springs) but untill mr collier has these we r stuffed right ..........wrong, i have just recieved a new sloted bolt from http://www.demonguns.com/shop.html only cost me $26.50 cheap as chips ,quality looks good (but not as good as aka ) and i will let you know how i get on with it after the next pa league event