The sentry turret weapons are Dual Miniguns (according to awareness function), so in _itempid.fos we see that it's ProtoId 518.
You can open weapon.fopro in a text editor, or object editor, and change it's values like any other weapon. You can change things like the min/max damage per round, how many rounds are fired in a burst, AP cost, etc.
[Proto]
ProtoId=518
Type=3
PicMap=art\items\gunautoc.frm
PicInv=art\inven\gunautoc.frm
Flags=134218143
DisableEgg=1
Deteriorable=1
Weight=4535
Volume=1
SoundId=48
Material=1
Weapon_Anim1=12
Weapon_MaxAmmoCount=800
Weapon_Caliber=6
Weapon_DefaultAmmoPid=35
Weapon_MinStrength=1
Weapon_ActiveUses=1
Weapon_CriticalFailture=2
Weapon_Skill_0=201
Weapon_Skill_1=200
Weapon_Skill_2=200
Weapon_DmgType_0=1
Weapon_Anim2_0=Anim2Burst
Weapon_PicUse_0=art\intrface\burst.frm
Weapon_PicUse_1=art\intrface\blank.frm
Weapon_PicUse_2=art\intrface\blank.frm
Weapon_DmgMin_0=10
Weapon_DmgMax_0=14
Weapon_MaxDist_0=40
Weapon_Round_0=40
Weapon_ApCost_0=6
Weapon_SoundId_0=76
Also, you have other options as well. Maybe you don't want them to do more DAMAGE, but want to change some of the turrets parameters for other reasons.
Open sad_enter.fomap in text editor or mapper, and you can see the script name and function on the turrets. It's warehouse_turret@_TurretInit
Here's that function in that script:
// Turret functions
void _TurretInit( Critter& turret, bool firstTime )
{
turret.SetEvent( CRITTER_EVENT_IDLE, "_TurretIdle" );
turret.SetEvent( CRITTER_EVENT_SHOW_CRITTER, "_TurretShowCritter" );
turret.SetEvent( CRITTER_EVENT_PLANE_BEGIN, "_TurretBeginPlane" );
turret.ModeBase[ MODE_UNLIMITED_AMMO ] = 1;
}
You can set different stats for the turret here, also.
For an example, here's the function in replication.fos for the turret in the Hell map:
void _TurretInit( Critter& turret, bool firstTime )
{
turret.StatBase[ ST_PERCEPTION ] = 10;
turret.SkillBase[ SK_BIG_GUNS ] = 300;
turret.SkillBase[ SK_ENERGY_WEAPONS ] = 300;
turret.ModeBase[ MODE_NO_ENEMY_STACK ] = 1;
turret.ModeBase[ MODE_UNLIMITED_AMMO ] = 1;
}
So you have a few options to make them more challenging, or deadly, or whatever you wish.