From a total of 66,273,974 kills with 30,505,953 headshots

Rank	Weapon	Modifier	Kills	%	Ratio	Headshots	%	Ratio	HS:K
1		1.10	528,379	0.80%		454,884	1.49%		0.86
2		1.00	727,390	1.10%		545,299	1.79%		0.75
3		1.40	355,351	0.54%		261,848	0.86%		0.74
4		1.00	565,794	0.85%		409,558	1.34%		0.72
5		1.20	11,642,303	17.57%		8,314,723	27.26%		0.71
6		1.00	8,315,480	12.55%		5,845,916	19.16%		0.70
7		1.00	6,585,381	9.94%		4,515,275	14.80%		0.69
8		1.40	1,137,707	1.72%		772,613	2.53%		0.68
9		1.40	485,103	0.73%		317,857	1.04%		0.66
10		1.00	564,784	0.85%		367,144	1.20%		0.65
11		1.50	1,147,705	1.73%		724,699	2.38%		0.63
12		1.10	441,895	0.67%		265,274	0.87%		0.60
13		1.50	401,429	0.61%		227,644	0.75%		0.57
14		1.50	106,657	0.16%		60,695	0.20%		0.57
15		1.50	64,193	0.10%		36,334	0.12%		0.57
16		1.20	1,069,555	1.61%		548,541	1.80%		0.51
17		1.20	678,960	1.02%		331,115	1.09%		0.49
18		1.20	4,029,638	6.08%		1,949,809	6.39%		0.48
19		1.20	119,284	0.18%		47,967	0.16%		0.40
20		1.10	301,886	0.46%		97,144	0.32%		0.32
21		1.20	230,458	0.35%		73,798	0.24%		0.32
22		0.80	241,254	0.36%		60,249	0.20%		0.25
23		0.80	213,641	0.32%		49,075	0.16%		0.23
24		1.00	24,744,619	37.34%		4,228,479	13.86%		0.17
25		5.00	2	0.00%		0	0.00%		0.00
26		2.00	893,281	1.35%		13	0.00%		0.00
27		1.80	681,820	1.03%		0	0.00%		0.00
28		5.00	25	0.00%		0	0.00%		0.00