Which Heavy AR Is Best?

Is an M16A4 clone better than a 16" AR in 6.8x43mm?

As you can see, the 6.8 starts lighter, does more damage and does it at about the same ranges with the same accuracy.

You need to be stronger for the 6.8, but the ST requirement is still below average.

Loaded weapon, optics and light: M16A4 = 10.7 lb.  6.8 carbine = 9.9 lb.

Six-Eight is 0.8 lb. lighter.

The M16A4 catches up when you add four spare magazines.  The A4 also has 15 more shots at this point.

But basic loads are generally six spare mags and the 6.8 will tip the scales at 17.7 lb. with 189 rounds.

The M16A4 is 17.3 lb. with 210 rounds.

BUT...  The 189 rounds will sling 1,134 to 6,804 points of damage, averaging 3,969.

210 rounds of 5.56x45mm M855 will do 1,050 to 6,300 points, averaging 3,675.

This becomes, on average, 224.23 points of damage per pound for the 6.8 and 212.43 for the A4.