From a total of 66,246,277 kills with 30,497,377 headshots

Rank	Weapon	Modifier	Kills	%	Ratio	Headshots	%	Ratio	HS:K
1		0.80	213,503	0.32%		49,041	0.16%		0.23
2		0.80	241,097	0.36%		60,198	0.20%		0.25
3		1.00	6,582,771	9.94%		4,513,821	14.80%		0.69
4		1.00	564,743	0.85%		367,129	1.20%		0.65
5		1.00	24,730,151	37.33%		4,226,557	13.86%		0.17
6		1.00	727,307	1.10%		545,265	1.79%		0.75
7		1.00	8,313,195	12.55%		5,844,738	19.16%		0.70
8		1.00	565,749	0.85%		409,538	1.34%		0.72
9		1.10	441,833	0.67%		265,249	0.87%		0.60
10		1.10	528,178	0.80%		454,755	1.49%		0.86
11		1.10	301,863	0.46%		97,137	0.32%		0.32
12		1.20	11,638,155	17.57%		8,312,443	27.26%		0.71
13		1.20	678,659	1.02%		330,954	1.09%		0.49
14		1.20	230,435	0.35%		73,792	0.24%		0.32
15		1.20	1,069,493	1.61%		548,510	1.80%		0.51
16		1.20	4,027,590	6.08%		1,948,789	6.39%		0.48
17		1.20	119,254	0.18%		47,961	0.16%		0.40
18		1.40	355,330	0.54%		261,839	0.86%		0.74
19		1.40	485,022	0.73%		317,808	1.04%		0.66
20		1.40	1,137,559	1.72%		772,527	2.53%		0.68
21		1.50	64,185	0.10%		36,331	0.12%		0.57
22		1.50	106,652	0.16%		60,693	0.20%		0.57
23		1.50	1,147,609	1.73%		724,654	2.38%		0.63
24		1.50	401,412	0.61%		227,635	0.75%		0.57
25		1.80	681,479	1.03%		0	0.00%		0.00
26		2.00	893,026	1.35%		13	0.00%		0.00
27		5.00	25	0.00%		0	0.00%		0.00
28		5.00	2	0.00%		0	0.00%		0.00