Milsig's k-series will not shoot first strike out of the box... I have seen them being modded to the point of being able to shoot first strike but if you dont want to drill out your gun the M-series milsig is always an option they come ready to fire first strike or .68 cal. the M-series go from $599-$899 more pricey but if you are not new to magfed they are the way to go. Another thing is make sure to have atleast 4 mags when going out on the field i will be a hastle with one or two.