milsec is the spec the military uses. so it is a military only specification. no one other than the military will ever get milspec. you can use milspec parts. milspec is tight enough to work and loose enough to work dirty. even the military has special armorers that build their competition...
milspec
tight enough to work,loose enough to work dirty..not the best or most accurate,but will always send lead in the direction of people and places who need to receive it.. ;)
i was not sure if you had a precision one built or not.