Here you can see the settings and rules for MW3 Competitive Sniping:

Competitive Sniping(MW3) is played as a match of: Best of 3. So one team has to win 2 matches for a win. Each team will be allowed to host one game with his gamemode and map.
If a third game is required, both teams must negotiate on who chooses the gamemode, map, and side.

Breaking the rules and using/making forbidden Things will be punished and can lead to a lose or a win(or worse or better);

Spectating: Team only
Friendly Fire: Disabled
Forced Respawns: Enabled
Wave Spawn Delay: None
Respawn Delay: None (only capture the flag)
Max Health: Miniscule
Health Regeneration: Normal
Killcam: Enabled
Headshots Only: Disabled
Perks: Enabled
Killstreak Rewards: Disabled
Number of Lives: Unlimited
Hardcore Mode: Disabled
3rd Person: Disabled
It is not allowed to join during the Session is in progress.
Classes can be made by the host.

Time Limit: Unlimited
Score Limit: 500 Points
HQ Lifetime: 45 Seconds
Activate Delay: 15 Seconds
Respawn Delay: None

Time Limit: Unlimited
Score Limit: 3 Points
Respawn Delay: 5 Seconds

Time Limit: Unlimited
Score Limit: 200 Points
Respawn Delay: None

Time Limit: Unlimited
Bomb Timer: 45 Seconds
Plant Time: 2.5 Seconds
Defuse Time: 5 Seconds
Respawn Delay: None
Shared Bomb Timer: No
Score Limit: automatically one
Round Switch: Every Round

Time Limit: 3 Minutes
Round Switch: Every Round
Bomb Timer: 45 Seconds
Plant Time: 5 Seconds
Defuse Time: 5 Seconds
Extra Time: 2.5 Minutes
Respawn Delay: None

Time Limit: Unlimited
Score Limit: 8 Points
Round Switch: 4 Rounds
Bomb Timer: 45 Seconds
Multi Bomb: Disabled
Defuse Time: 5 Seconds
Plant Time: 5 Seconds

Weapons: MSR and L118A Only
Proficiency/Skill: Everything allowed
Attachments: Extened Mags
First Perk: Sleight of Hand, Extreme Conditioning, Scavenger
Second Perk: Quick Draw Only
Third Perk: Everything except Steady aim and Sitrep
Death Streak: Holi Points Only
Equipment: Not allowed to use them
The host can make classes with the things, which are allowed, so you have not to make classes, if you want.

All maps are allowed except:
Interchange
Mission

Kinfe other enemys
Hardscoping, Dragscope and holding breath
Using of Equipment
Using other Things, as listed
Using Secondary (no running and shooting with it)
Ghosting the enemy team
IMPORTANT: Noscope is allowed!!!!