I am a newb when it comes to the ar world, but I have a bushy carbon15 that is all pimped, but the problem is I want to use it to harvest my antelope, and deer this year. I am looking at complete uppers, similar to the kit herehttp://palmettostatearmory.com/653.php. I know you must use .25 cal(6mm) minimum on big game here, will this kinda kit work with the lower I have even though my lower states it shoot .223/5.56?