Record the serial number then contact the company. Using the serial number they can tell you the year it was made.
@ 1m
M16A2 rifle
Biggest rifle as in longest?If so, it is the m16a2,a3,a4 rifle.
.223 caliber or 5.56mm.
Sports(which stands for; Slap, Pull, Observe, Release, Tap and Shoot)http://www.armystudyguide.com/content/army_board_study_guide_topics/m16a2/m16a2-study-guide.shtml
Proofhouse.com has sn tables
M16A2 & M16A4 rifles and M4 series carbines.
A round will not chamber.
5.56,hope i helped,by the way my favourite rifle is the m16a2
Proofhouse.com has sn tables
By the first two digits of the serial number. AB
550 metres at a point target, 800 metres at an area target.