From a total of 66,236,539 kills with 30,494,440 headshots

Rank	Weapon	Modifier	Kills	%	Ratio	Headshots	%	Ratio	HS:K
1		1.00	6,581,980	9.94%		4,513,392	14.80%		0.69
2		1.00	564,731	0.85%		367,124	1.20%		0.65
3		1.00	24,724,981	37.33%		4,225,883	13.86%		0.17
4		1.20	11,636,640	17.57%		8,311,546	27.26%		0.71
5		1.40	355,324	0.54%		261,836	0.86%		0.74
6		1.00	727,289	1.10%		545,259	1.79%		0.75
7		1.50	64,183	0.10%		36,331	0.12%		0.57
8		5.00	25	0.00%		0	0.00%		0.00
9		0.80	213,466	0.32%		49,031	0.16%		0.23
10		1.10	441,797	0.67%		265,230	0.87%		0.60
11		1.40	484,996	0.73%		317,792	1.04%		0.66
12		1.80	681,361	1.03%		0	0.00%		0.00
13		2.00	892,820	1.35%		13	0.00%		0.00
14		1.20	678,560	1.02%		330,893	1.09%		0.49
15		1.20	230,427	0.35%		73,791	0.24%		0.32
16		1.00	8,312,524	12.55%		5,844,419	19.17%		0.70
17		1.50	106,651	0.16%		60,693	0.20%		0.57
18		1.20	1,069,462	1.61%		548,498	1.80%		0.51
19		1.50	1,147,579	1.73%		724,641	2.38%		0.63
20		1.20	4,026,902	6.08%		1,948,435	6.39%		0.48
21		1.10	528,081	0.80%		454,702	1.49%		0.86
22		0.80	241,008	0.36%		60,180	0.20%		0.25
23		1.00	565,735	0.85%		409,532	1.34%		0.72
24		5.00	2	0.00%		0	0.00%		0.00
25		1.50	401,406	0.61%		227,632	0.75%		0.57
26		1.20	119,253	0.18%		47,961	0.16%		0.40
27		1.40	1,137,504	1.72%		772,495	2.53%		0.68
28		1.10	301,852	0.46%		97,131	0.32%		0.32