From a total of 66,917,544 kills with 30,691,439 headshots

Rank	Weapon	Modifier	Kills	%	Ratio	Headshots	%	Ratio	HS:K
1		1.00	25,117,650	37.54%		4,279,177	13.94%		0.17
2		1.20	11,737,868	17.54%		8,366,788	27.26%		0.71
3		1.00	8,347,410	12.47%		5,862,277	19.10%		0.70
4		1.00	6,628,105	9.90%		4,538,685	14.79%		0.68
5		1.20	4,084,292	6.10%		1,976,720	6.44%		0.48
6		1.50	1,150,693	1.72%		726,418	2.37%		0.63
7		1.40	1,141,201	1.71%		774,733	2.52%		0.68
8		1.20	1,071,298	1.60%		549,424	1.79%		0.51
9		2.00	899,273	1.34%		13	0.00%		0.00
10		1.00	729,028	1.09%		546,175	1.78%		0.75
11		1.80	689,350	1.03%		0	0.00%		0.00
12		1.20	683,904	1.02%		333,488	1.09%		0.49
13		1.00	567,050	0.85%		410,170	1.34%		0.72
14		1.00	565,618	0.85%		367,549	1.20%		0.65
15		1.10	530,569	0.79%		456,334	1.49%		0.86
16		1.40	486,953	0.73%		318,947	1.04%		0.65
17		1.10	443,380	0.66%		266,012	0.87%		0.60
18		1.50	402,798	0.60%		228,383	0.74%		0.57
19		1.40	355,955	0.53%		262,154	0.85%		0.74
20		1.10	302,421	0.45%		97,352	0.32%		0.32
21		0.80	243,739	0.36%		61,003	0.20%		0.25
22		1.20	232,420	0.35%		74,577	0.24%		0.32
23		0.80	215,374	0.32%		49,553	0.16%		0.23
24		1.20	119,789	0.18%		48,189	0.16%		0.40
25		1.50	106,936	0.16%		60,859	0.20%		0.57
26		1.50	64,443	0.10%		36,459	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