[h3bus]

Fast answer: add in section "Configs"->"Primary Aim"->"Primary"

"weapon_awp" "-1"

But I guess this is time for me to give a practictal example of how the configuration works.
When you say "default dm" I guess you are refering to configuration loaded on de_/cs_ maps. As these maps match no entry in "Maps" section of the default configuration I provided, the loaded configuration is "Maps"->"".

Lets have a look at it
"Maps"->""

"Load"
{
    "Maps" "fy"
}

So we can see here that this section will only load "Maps"->"fy" (and we can allready conclude that fy_ maps will have the same configuration as the default ones - This is also the case for "gg" maps).

Let's have look into "Maps"->"fy"

"LoadRound"
{
    "Game Modes" "Deathmatch"
}

"LoadWarmup"
{
    "Game Modes" "Default Warmups"
}

What is done here is:
- At beginning of warmup "Game Modes"->"Default Warmups" will be loaded
- After Warmup "Game Modes"->"Deathmatch" will be loaded

Let's just look into "Game Modes"->"Deathmatch" as warmup is not our concern here.

"Load"
{
    "Configs" "Options Default"
    "Configs" "Primary Aim"
    "Configs" "Secondary Aim"
    "Configs" "Random Spawn"
}

Configuration loads4 sections here
- "Configs"->"Options Default": here stand all the standrd configuration. You can have a look at it, its just a big Cvar section.
- "Configs"->"Primary Aim": That looks like what we are searching for!
- "Configs"->"Secondary Aim": Loads the Secondary weapons
- "Configs"->"Random Spawn": Enable random spawming in the map

And then in "Configs"->"Primary Aim"

"Primary"
{
    // Weapon.         // Limit.
    "weapon_ak47"            "-1"
    "weapon_m4a1"             "-1"
    "weapon_m4a1_silencer"    "-1"
    "weapon_sg556"             "-1"
    "weapon_aug"               "-1"
    "weapon_galilar"           "-1"
    "weapon_famas"             "-1"
    "weapon_ssg08"             "-1"
}

That's what you need to modify!

A quick note on weapons name as this is not straighforward, here is the list of available weapons:

Spoiler

This is just an extract from the code, "weaponEntityName" is what must be set in configuration file

 // Primary weapons
 weapons_Add(.weaponEntityName = "weapon_ak47",          .weaponName = "AK-47",          .weaponPrimary = true,  .weaponReloadTime = 2.5, .weaponClipSize = 30,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_m4a1",          .weaponName = "M4A1",           .weaponPrimary = true,  .weaponReloadTime = 3.4, .weaponClipSize = 30,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_m4a1_silencer", .weaponName = "M4A1-S",         .weaponPrimary = true,  .weaponReloadTime = 3.4, .weaponClipSize = 20,   .weaponAmmoMax = 40);
 weapons_Add(.weaponEntityName = "weapon_sg556",         .weaponName = "SG 553",         .weaponPrimary = true,  .weaponReloadTime = 3.0, .weaponClipSize = 30,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_aug",           .weaponName = "AUG",            .weaponPrimary = true,  .weaponReloadTime = 3.8, .weaponClipSize = 30,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_galilar",       .weaponName = "Galil AR",       .weaponPrimary = true,  .weaponReloadTime = 3.3, .weaponClipSize = 35,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_famas",         .weaponName = "FAMAS",          .weaponPrimary = true,  .weaponReloadTime = 3.4, .weaponClipSize = 25,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_awp",           .weaponName = "AWP",            .weaponPrimary = true,  .weaponReloadTime = 3.8, .weaponClipSize = 10,   .weaponAmmoMax = 30);
 weapons_Add(.weaponEntityName = "weapon_ssg08",         .weaponName = "Scout",          .weaponPrimary = true,  .weaponReloadTime = 3.9, .weaponClipSize = 10,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_g3sg1",         .weaponName = "G3SG1",          .weaponPrimary = true,  .weaponReloadTime = 5.0, .weaponClipSize = 20,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_scar20",        .weaponName = "SCAR-20",        .weaponPrimary = true,  .weaponReloadTime = 5.0, .weaponClipSize = 20,   .weaponAmmoMax = 90);
 weapons_Add(.weaponEntityName = "weapon_m249",          .weaponName = "M249",           .weaponPrimary = true,  .weaponReloadTime = 5.0, .weaponClipSize = 100,  .weaponAmmoMax = 200);
 weapons_Add(.weaponEntityName = "weapon_negev",         .weaponName = "Negev",          .weaponPrimary = true,  .weaponReloadTime = 5.9, .weaponClipSize = 150,  .weaponAmmoMax = 200);
 weapons_Add(.weaponEntityName = "weapon_nova",          .weaponName = "Nova",           .weaponPrimary = true,  .weaponReloadTime = 6.0, .weaponClipSize = 8,    .weaponAmmoMax = 32);
 weapons_Add(.weaponEntityName = "weapon_xm1014",        .weaponName = "XM1014",         .weaponPrimary = true,  .weaponReloadTime = 5.2, .weaponClipSize = 7,    .weaponAmmoMax = 32);
 weapons_Add(.weaponEntityName = "weapon_sawedoff",      .weaponName = "Sawed-Off",      .weaponPrimary = true,  .weaponReloadTime = 6.0, .weaponClipSize = 7,    .weaponAmmoMax = 32);
 weapons_Add(.weaponEntityName = "weapon_mag7",          .weaponName = "MAG-7",          .weaponPrimary = true,  .weaponReloadTime = 3.0, .weaponClipSize = 5,    .weaponAmmoMax = 32);
 weapons_Add(.weaponEntityName = "weapon_mac10",         .weaponName = "MAC-10",         .weaponPrimary = true,  .weaponReloadTime = 3.5, .weaponClipSize = 30,   .weaponAmmoMax = 100);
 weapons_Add(.weaponEntityName = "weapon_mp9",           .weaponName = "MP9",            .weaponPrimary = true,  .weaponReloadTime = 2.3, .weaponClipSize = 30,   .weaponAmmoMax = 120);
 weapons_Add(.weaponEntityName = "weapon_mp7",           .weaponName = "MP7",            .weaponPrimary = true,  .weaponReloadTime = 3.5, .weaponClipSize = 30,   .weaponAmmoMax = 120);
 weapons_Add(.weaponEntityName = "weapon_ump45",         .weaponName = "UMP-45",         .weaponPrimary = true,  .weaponReloadTime = 3.8, .weaponClipSize = 25,   .weaponAmmoMax = 100);
 weapons_Add(.weaponEntityName = "weapon_p90",           .weaponName = "P90",            .weaponPrimary = true,  .weaponReloadTime = 3.5, .weaponClipSize = 50,   .weaponAmmoMax = 100);
 weapons_Add(.weaponEntityName = "weapon_bizon",         .weaponName = "PP-Bizon",       .weaponPrimary = true,  .weaponReloadTime = 2.5, .weaponClipSize = 64,   .weaponAmmoMax = 120);
 // Secondary weapons
 weapons_Add(.weaponEntityName = "weapon_glock",         .weaponName = "Glock",          .weaponPrimary = false, .weaponReloadTime = 2.2, .weaponClipSize = 20,  .weaponAmmoMax = 120);
 weapons_Add(.weaponEntityName = "weapon_p250",          .weaponName = "P250",           .weaponPrimary = false, .weaponReloadTime = 2.5, .weaponClipSize = 13,  .weaponAmmoMax = 52);
 weapons_Add(.weaponEntityName = "weapon_usp_silencer",  .weaponName = "USP-S",          .weaponPrimary = false, .weaponReloadTime = 2.5, .weaponClipSize = 12,  .weaponAmmoMax = 24);
 weapons_Add(.weaponEntityName = "weapon_fiveseven",     .weaponName = "Five-SeveN",     .weaponPrimary = false, .weaponReloadTime = 2.5, .weaponClipSize = 20,  .weaponAmmoMax = 100);
 weapons_Add(.weaponEntityName = "weapon_deagle",        .weaponName = "Desert Eagle",   .weaponPrimary = false, .weaponReloadTime = 2.2, .weaponClipSize = 7,   .weaponAmmoMax = 35);
 weapons_Add(.weaponEntityName = "weapon_elite",         .weaponName = "Dual Berettas",  .weaponPrimary = false, .weaponReloadTime = 3.8, .weaponClipSize = 30,  .weaponAmmoMax = 120);
 weapons_Add(.weaponEntityName = "weapon_tec9",          .weaponName = "Tec-9",          .weaponPrimary = false, .weaponReloadTime = 2.7, .weaponClipSize = 32,  .weaponAmmoMax = 120);
 weapons_Add(.weaponEntityName = "weapon_hkp2000",       .weaponName = "P2000",          .weaponPrimary = false, .weaponReloadTime = 2.5, .weaponClipSize = 13,  .weaponAmmoMax = 52);

Hope that helped!