In This Little Guide I Will Be Posting All The Required Levels For All The Weapons And Perks And What It Takes To Get Attachments.
And My Current Level. Which Changes By The Day.

My Current Level: 55

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Primary Weapons
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Assault Rifles
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1. M16A4 - You Get It From The Start
2. AK-47 - You Get It From The Start
3. M4 Carbine - Level 10
4. G3 - Level 25
5. G36C - Level 37
6. M14 - Level 46
7. MP44 - Level 52

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Sub Machine Guns
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1. MP5 - You Get It From The Start
2. Skorpion - You Get It From The Start
3. Mini Uzi - Level 13
4. AK-47u - Level 28
5. P90 - Level 40

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Light Machine Guns
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1. M249 SAW - You Get It From The Start
2. RPD - You Get It From The Start
3. M60E4 - level 19

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Shotguns
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1. W1200 - You Get It From The Start
2. M1014 - Level 31

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Sniper Rifles
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1. M40A3 - You Get It From The Start
2. M21 - Level 7
3. Dragunov - Level 22
4. R700 - Level 34
5. Barret .50 Cal - Level 49

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Side Arms
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1. M9 - You Get It From The Start
2. USP .45 - You Get It From The Start
3. M1911.45 - Level 16
4. Desert Eagle - Level 43

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Attachments
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1. Red Dot Sight - Get 25 Kills In Totall
2. Silencer - Get 75 Kills In Totall
3. ACOG Scope - Get 150 Kills In Totall

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Special Grenades
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1. Flash Grenade - You Get It From The Start
2. Stun Grenade - You Get It From The Start
3. Smoke Grenade - You Get It From The Start

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Perks
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Perks 1
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1. C4 x2 - You Get It From The Start
2. Special...