From a total of 66,298,860 kills with 30,513,408 headshots

Rank	Weapon	Modifier	Kills	%	Ratio	Headshots	%	Ratio	HS:K
1		5.00	2	0.00%		0	0.00%		0.00
2		5.00	25	0.00%		0	0.00%		0.00
3		2.00	893,488	1.35%		13	0.00%		0.00
4		1.80	682,094	1.03%		0	0.00%		0.00
5		1.50	401,463	0.61%		227,658	0.75%		0.57
6		1.50	1,147,807	1.73%		724,760	2.38%		0.63
7		1.50	106,663	0.16%		60,697	0.20%		0.57
8		1.50	64,204	0.10%		36,339	0.12%		0.57
9		1.40	1,137,830	1.72%		772,680	2.53%		0.68
10		1.40	485,189	0.73%		317,901	1.04%		0.66
11		1.40	355,367	0.54%		261,856	0.86%		0.74
12		1.20	119,301	0.18%		47,971	0.16%		0.40
13		1.20	4,032,118	6.08%		1,951,050	6.39%		0.48
14		1.20	1,069,628	1.61%		548,573	1.80%		0.51
15		1.20	230,468	0.35%		73,801	0.24%		0.32
16		1.20	679,229	1.02%		331,228	1.09%		0.49
17		1.20	11,645,816	17.57%		8,316,586	27.26%		0.71
18		1.10	301,925	0.46%		97,159	0.32%		0.32
19		1.10	528,467	0.80%		454,935	1.49%		0.86
20		1.10	441,952	0.67%		265,310	0.87%		0.60
21		1.00	565,854	0.85%		409,583	1.34%		0.72
22		1.00	8,317,319	12.55%		5,846,834	19.16%		0.70
23		1.00	727,471	1.10%		545,349	1.79%		0.75
24		1.00	24,757,709	37.34%		4,230,156	13.86%		0.17
25		1.00	564,836	0.85%		367,165	1.20%		0.65
26		1.00	6,587,507	9.94%		4,516,409	14.80%		0.69
27		0.80	241,392	0.36%		60,290	0.20%		0.25
28		0.80	213,736	0.32%		49,105	0.16%		0.23