Ouch.

code/modules/projectiles/projectile/bullets/dart_syringe.dm

@@ -15,7 +15,7 @@
 			if(M.can_inject(null, FALSE, def_zone, piercing)) // Pass the hit zone to see if it can inject by whether it hit the head or the body.
 				..()
 				if(skip == TRUE)
-					return
+					return BULLET_ACT_HIT
 				reagents.reaction(M, INJECT)
 				reagents.trans_to(M, reagents.total_volume)
 				return TRUE
@@ -27,7 +27,7 @@
 	..(target, blocked)
 	DISABLE_BITFIELD(reagents.reagents_holder_flags, NO_REACT)
 	reagents.handle_reactions()
-	return TRUE
+	return BULLET_ACT_HIT
 
 /obj/item/projectile/bullet/dart/metalfoam/Initialize()
 	. = ..()
@@ -70,11 +70,11 @@
 
 				target.visible_message("<span class='notice'>\The [src] beeps!</span>")
 				to_chat("<span class='notice'><i>You feel a tiny prick as a smartdart embeds itself in you with a beep.</i></span>")
-				return TRUE
+				return BULLET_ACT_HIT
 			else
 				blocked = 100
 				target.visible_message("<span class='danger'>\The [src] was deflected!</span>", \
 									   "<span class='userdanger'>You see a [src] bounce off you, booping sadly!</span>")
 
 	target.visible_message("<span class='danger'>\The [src] fails to land on target!</span>")
-	return TRUE
+	return BULLET_ACT_BLOCK

code/modules/projectiles/projectile/bullets/dnainjector.dm

@@ -12,7 +12,7 @@
 			if(M.can_inject(null, FALSE, def_zone, FALSE))
 				if(injector.inject(M, firer))
 					QDEL_NULL(injector)
-					return TRUE
+					return BULLET_ACT_HIT
 			else
 				blocked = 100
 				target.visible_message("<span class='danger'>\The [src] was deflected!</span>", \

code/modules/projectiles/projectile/bullets/grenade.dm

@@ -9,4 +9,4 @@
 /obj/item/projectile/bullet/a40mm/on_hit(atom/target, blocked = FALSE)
 	..()
 	explosion(target, -1, 0, 2, 1, 0, flame_range = 3)
-	return TRUE
+	return BULLET_ACT_HIT

code/modules/projectiles/projectile/bullets/shotgun.dm

@@ -53,7 +53,7 @@
 /obj/item/projectile/bullet/shotgun_frag12/on_hit(atom/target, blocked = FALSE)
 	..()
 	explosion(target, -1, 0, 1)
-	return TRUE
+	return BULLET_ACT_HIT
 
 /obj/item/projectile/bullet/pellet
 	var/tile_dropoff = 0.75

code/modules/projectiles/projectile/bullets/sniper.dm

@@ -34,7 +34,7 @@
 	icon_state = "gauss"
 	name = "penetrator round"
 	damage = 60
-	forcedodge = TRUE
+	movement_type = FLYING | UNSTOPPABLE
 	dismemberment = 0 //It goes through you cleanly.
 	knockdown = 0
 	breakthings = FALSE

code/modules/projectiles/projectile/bullets/special.dm

@@ -3,7 +3,7 @@
 /obj/item/projectile/bullet/honker
 	damage = 0
 	knockdown = 60
-	forcedodge = TRUE
+	movement_type = FLYING | UNSTOPPABLE
 	nodamage = TRUE
 	candink = FALSE
 	hitsound = 'sound/items/bikehorn.ogg'