From a total of 67,224,422 kills with 30,789,414 headshots

Rank	Weapon	Modifier	Kills	%	Ratio	Headshots	%	Ratio	HS:K
1		1.00	25,272,986	37.59%		4,300,282	13.97%		0.17
2		1.20	11,807,838	17.56%		8,406,934	27.30%		0.71
3		1.00	8,355,283	12.43%		5,865,954	19.05%		0.70
4		1.00	6,648,070	9.89%		4,549,367	14.78%		0.68
5		1.20	4,112,347	6.12%		1,990,120	6.46%		0.48
6		1.50	1,152,306	1.71%		727,231	2.36%		0.63
7		1.40	1,144,487	1.70%		776,678	2.52%		0.68
8		1.20	1,072,037	1.59%		549,720	1.79%		0.51
9		2.00	903,753	1.34%		13	0.00%		0.00
10		1.00	729,973	1.09%		546,681	1.78%		0.75
11		1.80	692,793	1.03%		0	0.00%		0.00
12		1.20	686,276	1.02%		334,675	1.09%		0.49
13		1.00	567,355	0.84%		410,326	1.33%		0.72
14		1.00	565,914	0.84%		367,685	1.19%		0.65
15		1.10	532,283	0.79%		457,193	1.48%		0.86
16		1.40	488,381	0.73%		319,815	1.04%		0.65
17		1.10	443,904	0.66%		266,278	0.86%		0.60
18		1.50	403,533	0.60%		228,739	0.74%		0.57
19		1.40	357,093	0.53%		262,720	0.85%		0.74
20		1.10	302,793	0.45%		97,512	0.32%		0.32
21		0.80	244,757	0.36%		61,358	0.20%		0.25
22		1.20	232,239	0.35%		74,551	0.24%		0.32
23		0.80	216,283	0.32%		49,788	0.16%		0.23
24		1.20	119,952	0.18%		48,254	0.16%		0.40
25		1.50	107,219	0.16%		61,021	0.20%		0.57
26		1.50	64,540	0.10%		36,519	0.12%		0.57
27		5.00	25	0.00%		0	0.00%		0.00
28		5.00	2	0.00%		0	0.00%		0.00