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Lightweight with Troy Medieval flash-hider.
Heavy with DPMS 5.5" Slip-Over flash-hider.
M4 with YHM folding front sight and M16A2 flash-hider.
20" Military Profile from top to bottom.
M16A2 without a flash-hider.
M16/M16A1 with M16A1 flash-hider.
16" Heavy and 20" HBAR.
Top: HBAR with YHM folding sight and DPMS 5.5" Slip-Over flash-hider.
Bottom: Heavy with DPMS 5.5" Slip-Over flash-hider.
The M16A2 barrel is only heavier than the M16/M16A1 barrel from the front sight to the muzzle threads. This change was made because of soldiers using their rifles as pry-bars.
The M4 has the same basic profile as the M16A2, but 5.5" shorter in the mil-spec version (4" as shown here). The narrow section between the muzzle and the front sight is for mounting an M203 grenade launcher.
The heavy barrels were developed for National Match target shooting. In the 20", the HBAR is 1.5 pounds heavier than the M16A2; in 16" the HB is 1 pound heavier than the lightweight.
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