Replace your default AK-47 and M4 weapon lines :

M-16 mode :

--AK-47--

$ AK47				INSTANT_HIT	 40.0 70.0	355	-1		5	riflebad	30	 30		0.78 -0.06  0.13    0  0	0.40 0.9 	 6 10  7	 6 10  7  99	7001
$ AK47				INSTANT_HIT	145.0 170.0	355	-1		5	rifle		30	 30		0.78 -0.06  0.13    1  200	0.50 1.0 	 6  8  6	 6  8  6  99	7011
$ AK47				INSTANT_HIT	250.0 270.0	355	-1		5	rifle		30	 70		0.78 -0.06  0.13    2  999	0.60 1.1 	 6  8  6	 6  8  6  99	7031

--M4--

$ M4				INSTANT_HIT	 40.0 90.0	356	-1		5	riflebad	50	 30		0.74 -0.04  0.13    0  0	0.45 0.9 	 6 10  7	 6 10  7  99	7001
$ M4				INSTANT_HIT	145.0 190.0	356	-1		5	rifle		50	 30		0.74 -0.04  0.13    1  200	0.65 1.0 	 6  8  6	 6  8  6  99	7011
$ M4				INSTANT_HIT	250.0 290.0	356	-1		5	rifle		50	 70		0.74 -0.04  0.13    2  999	0.80 1.1 	 6  8  6	 6  8  6  99	7031

One-shot dead like Sniper Rifle :

--AK-47--

$ AK47				INSTANT_HIT	 40.0 70.0	355	-1		5	riflebad	30	 30		0.78 -0.06  0.13    0  0	0.40 0.9 	 6 10  7	 6 10  7  99	7001
$ AK47				INSTANT_HIT	145.0 170.0	355	-1		5	rifle		30	 30		0.78 -0.06  0.13    1  200	0.50 1.0 	 6  8  6	 6  8  6  99	7011
$ AK47				INSTANT_HIT	150.0 270.0	355	-1		5	rifle		30	 130		0.78 -0.06  0.13    2  999	0.60 1.1 	 6  8  6	 6  8  6  99	7031

--M4--

$ M4				INSTANT_HIT	 40.0 90.0	356	-1		5	riflebad	50	 30		0.74 -0.04  0.13    0  0	0.45 0.9 	 6 10  7	 6 10  7  99	7001
$ M4				INSTANT_HIT	145.0 190.0	356	-1		5	rifle		50	 30		0.74 -0.04  0.13    1  200	0.65 1.0 	 6  8  6	 6  8  6  99	7011
$ M4				INSTANT_HIT	150.0 290.0	356	-1		5	rifle		50	 130		0.74 -0.04  0.13    2  999	0.80 1.1 	 6  8  6	 6  8  6  99	7031

Long Range Mode :

--AK-47--

$ AK47				INSTANT_HIT	 40.0 70.0	355	-1		5	riflebad	30	 30		0.78 -0.06  0.13    0  0	0.40 0.9 	 6 10  7	 6 10  7  99	7001
$ AK47				INSTANT_HIT	145.0 170.0	355	-1		5	rifle		30	 30		0.78 -0.06  0.13    1  200	0.50 1.0 	 6  8  6	 6  8  6  99	7011
$ AK47				INSTANT_HIT	650.0 670.0	355	-1		5	rifle		30	 70		0.78 -0.06  0.13    2  999	0.60 1.1 	 6  8  6	 6  8  6  99	7031

--M4--

$ M4				INSTANT_HIT	 40.0 90.0	356	-1		5	riflebad	50	 30		0.74 -0.04  0.13    0  0	0.45 0.9 	 6 10  7	 6 10  7  99	7001
$ M4				INSTANT_HIT	145.0 190.0	356	-1		5	rifle		50	 30		0.74 -0.04  0.13    1  200	0.65 1.0 	 6  8  6	 6  8  6  99	7011
$ M4				INSTANT_HIT	650.0 690.0	356	-1		5	rifle		50	 70		0.74 -0.04  0.13    2  999	0.80 1.1 	 6  8  6	 6  8  6  99	7031

AK-47 Mode :

--AK-47--

$ AK47				INSTANT_HIT	 40.0 70.0	355	-1		5	riflebad	30	 30		0.78 -0.06  0.13    0  0	0.40 0.9 	 6 10  7	 6 10  7  99	7001
$ AK47				INSTANT_HIT	145.0 170.0	355	-1		5	rifle		30	 30		0.78 -0.06  0.13    1  200	0.50 1.0 	 6  9  6	 6  9  6  99	7011
$ AK47				INSTANT_HIT	250.0 270.0	355	-1		5	rifle		30	 70		0.78 -0.06  0.13    2  999	0.60 1.1 	 6  9  6	 6  9  6  99	7031

--M4--

$ M4				INSTANT_HIT	 40.0 90.0	356	-1		5	riflebad	50	 30		0.74 -0.04  0.13    0  0	0.45 0.9 	 6 10  7	 6 10  7  99	7001
$ M4				INSTANT_HIT	145.0 190.0	356	-1		5	rifle		50	 30		0.74 -0.04  0.13    1  200	0.65 1.0 	 6  9  6	 6  9  6  99	7011
$ M4				INSTANT_HIT	250.0 290.0	356	-1		5	rifle		50	 70		0.74 -0.04  0.13    2  999	0.80 1.1 	 6  9  6	 6  9  6  99	7031


--- FOR BACKUP ---

-- AK-47 --

$ AK47				INSTANT_HIT	40.0 70.0	355	-1		5	riflebad	30	 30		0.78 -0.06  0.13    0  0	0.40 0.9 	 6 10  7	 6 10  7  99	7001
$ AK47				INSTANT_HIT	45.0 70.0	355	-1		5	rifle		30	 30		0.78 -0.06  0.13    1  200	0.50 1.0 	 6 10  7	 6 10  7  99	7011
$ AK47				INSTANT_HIT	50.0 70.0	355	-1		5	rifle		30	 30		0.78 -0.06  0.13    2  999	0.60 1.1 	 6 10  7	 6 10  7  99	7031

-- M4 --

$ M4				INSTANT_HIT	40.0 90.0	356	-1		5	riflebad	50	 30		0.74 -0.04  0.13    0  0	0.45 0.9 	 6 10  7	 6 10  7  99	7001
$ M4				INSTANT_HIT	45.0 90.0	356	-1		5	rifle		50	 30		0.74 -0.04  0.13    1  200	0.65 1.0 	 6 10  7	 6 10  7  99	7011
$ M4				INSTANT_HIT	50.0 90.0	356	-1		5	rifle		50	 30		0.74 -0.04  0.13    2  999	0.80 1.1 	 6 10  7	 6 10  7  99	7031

ENJOY :) 