diff --git a/src/p_local.h b/src/p_local.h
index 301b36ad7..21c5db78b 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -328,10 +328,11 @@ enum	// P_LineAttack flags
 	LAF_NOIMPACTDECAL = 4,
 	LAF_NOINTERACT =	8,
 	LAF_TARGETISSOURCE = 16,
+	LAF_OVERRIDEZ =		32,
 };
 
-AActor *P_LineAttack(AActor *t1, DAngle angle, double distance, DAngle pitch, int damage, FName damageType, PClassActor *pufftype, int flags = 0, FTranslatedLineTarget *victim = NULL, int *actualdamage = NULL);
-AActor *P_LineAttack(AActor *t1, DAngle angle, double distance, DAngle pitch, int damage, FName damageType, FName pufftype, int flags = 0, FTranslatedLineTarget *victim = NULL, int *actualdamage = NULL);
+AActor *P_LineAttack(AActor *t1, DAngle angle, double distance, DAngle pitch, int damage, FName damageType, PClassActor *pufftype, int flags = 0, FTranslatedLineTarget *victim = NULL, int *actualdamage = NULL, double sz = 0.0);
+AActor *P_LineAttack(AActor *t1, DAngle angle, double distance, DAngle pitch, int damage, FName damageType, FName pufftype, int flags = 0, FTranslatedLineTarget *victim = NULL, int *actualdamage = NULL, double sz = 0.0);
 
 void	P_TraceBleed(int damage, const DVector3 &pos, AActor *target, DAngle angle, DAngle pitch);
 void	P_TraceBleed(int damage, AActor *target, DAngle angle, DAngle pitch);
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 5ffcbc423..66becf1fe 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -4390,7 +4390,7 @@ static ETraceStatus CheckForActor(FTraceResults &res, void *userdata)
 //==========================================================================
 
 AActor *P_LineAttack(AActor *t1, DAngle angle, double distance,
-	DAngle pitch, int damage, FName damageType, PClassActor *pufftype, int flags, FTranslatedLineTarget*victim, int *actualdamage)
+	DAngle pitch, int damage, FName damageType, PClassActor *pufftype, int flags, FTranslatedLineTarget*victim, int *actualdamage, double sz)
 {
 	bool nointeract = !!(flags & LAF_NOINTERACT);
 	DVector3 direction;
@@ -4435,6 +4435,12 @@ AActor *P_LineAttack(AActor *t1, DAngle angle, double distance,
 		shootz += 8;
 	}
 
+	// [MC] If overriding, set it to the base of the actor.
+	// Offset by the amount specified.
+	if (flags & LAF_OVERRIDEZ)
+		shootz = t1->Z();
+	shootz += sz;
+
 	// We need to check the defaults of the replacement here
 	AActor *puffDefaults = GetDefaultByType(pufftype->GetReplacement());
 	
@@ -4691,7 +4697,7 @@ AActor *P_LineAttack(AActor *t1, DAngle angle, double distance,
 }
 
 AActor *P_LineAttack(AActor *t1, DAngle angle, double distance,
-	DAngle pitch, int damage, FName damageType, FName pufftype, int flags, FTranslatedLineTarget *victim, int *actualdamage)
+	DAngle pitch, int damage, FName damageType, FName pufftype, int flags, FTranslatedLineTarget *victim, int *actualdamage, double sz)
 {
 	PClassActor *type = PClass::FindActor(pufftype);
 	if (type == NULL)
@@ -4705,7 +4711,7 @@ AActor *P_LineAttack(AActor *t1, DAngle angle, double distance,
 	}
 	else
 	{
-		return P_LineAttack(t1, angle, distance, pitch, damage, damageType, type, flags, victim, actualdamage);
+		return P_LineAttack(t1, angle, distance, pitch, damage, damageType, type, flags, victim, actualdamage, sz);
 	}
 }
 
@@ -4720,10 +4726,11 @@ DEFINE_ACTION_FUNCTION(AActor, LineAttack)
 	PARAM_CLASS(puffType, AActor);
 	PARAM_INT_DEF(flags);
 	PARAM_POINTER_DEF(victim, FTranslatedLineTarget);
+	PARAM_FLOAT_DEF(offsetz);
 
 	int acdmg;
 	if (puffType == nullptr) puffType = PClass::FindActor("BulletPuff");	// P_LineAttack does not work without a puff to take info from.
-	auto puff = P_LineAttack(self, angle, distance, pitch, damage, damageType, puffType, flags, victim, &acdmg);
+	auto puff = P_LineAttack(self, angle, distance, pitch, damage, damageType, puffType, flags, victim, &acdmg, offsetz);
 	if (numret > 0) ret[0].SetObject(puff);
 	if (numret > 1) ret[1].SetInt(acdmg), numret = 2;
 	return numret;
diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index 2abd552c9..49d294465 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -585,7 +585,7 @@ class Actor : Thinker native
 	native virtual int DamageMobj(Actor inflictor, Actor source, int damage, Name mod, int flags = 0, double angle = 0);
 	native void PoisonMobj (Actor inflictor, Actor source, int damage, int duration, int period, Name type);
 	native double AimLineAttack(double angle, double distance, out FTranslatedLineTarget pLineTarget = null, double vrange = 0., int flags = 0, Actor target = null, Actor friender = null);
-	native Actor, int LineAttack(double angle, double distance, double pitch, int damage, Name damageType, class<Actor> pufftype, int flags = 0, out FTranslatedLineTarget victim = null);
+	native Actor, int LineAttack(double angle, double distance, double pitch, int damage, Name damageType, class<Actor> pufftype, int flags = 0, out FTranslatedLineTarget victim = null, double offsetz = 0.);
 	native bool CheckSight(Actor target, int flags = 0);
 	native bool IsVisible(Actor other, bool allaround, LookExParams params = null);
 	native bool HitFriend();
diff --git a/wadsrc/static/zscript/constants.txt b/wadsrc/static/zscript/constants.txt
index 5477d24ee..b698f966f 100644
--- a/wadsrc/static/zscript/constants.txt
+++ b/wadsrc/static/zscript/constants.txt
@@ -881,6 +881,7 @@ enum ELineAttackFlags
 	LAF_NORANDOMPUFFZ = 2,
 	LAF_NOIMPACTDECAL = 4,
 	LAF_NOINTERACT =	8,
+	LAF_OVERRIDEZ =		32,
 }
 
 const DEFMELEERANGE = 64;