ok

code/modules/mob/living/carbon/human/human_helpers.dm

@@ -143,19 +143,19 @@
 	var/protection = (prot["head"] + prot["arms"] + prot["feet"] + prot["legs"] + prot["groin"] + prot["chest"] + prot["hands"])/7
 	return protection
 
-/mob/living/carbon/human/can_use_guns(var/obj/item/G)
+/mob/living/carbon/human/can_use_guns(obj/item/G)
 	. = ..()
 
 	if(G.trigger_guard == TRIGGER_GUARD_NORMAL)
 		if(src.dna.check_mutation(HULK))
 			to_chat(src, "<span class='warning'>Your meaty finger is much too large for the trigger guard!</span>")
-			return 0
+			return FALSE
 		if(NOGUNS in src.dna.species.species_traits)
 			to_chat(src, "<span class='warning'>Your fingers don't fit in the trigger guard!</span>")
-			return 0
+			return FALSE
 	if(mind)
 		if(mind.martial_art && mind.martial_art.no_guns) //great dishonor to famiry
 			to_chat(src, "<span class='warning'>Use of ranged weaponry would bring dishonor to the clan.</span>")
-			return 0
+			return FALSE
 
 	return .

code/modules/mob/living/carbon/monkey/monkey.dm

@@ -140,8 +140,8 @@
 		return 0
 	return 1
 
-/mob/living/carbon/monkey/can_use_guns(var/obj/item/G)
-	return 1
+/mob/living/carbon/monkey/can_use_guns(obj/item/G)
+	return TRUE
 
 /mob/living/carbon/monkey/angry
 	aggressive = TRUE

code/modules/mob/living/living.dm

@@ -241,7 +241,7 @@
 		return 1
 
 /mob/living/proc/InCritical()
-	return (health < 0 && health > -100 && stat == UNCONSCIOUS)
+	return (health < HEALTH_THRESHOLD_CRIT && health > HEALTH_THRESHOLD_DEAD && stat == UNCONSCIOUS)
 
 //This proc is used for mobs which are affected by pressure to calculate the amount of pressure that actually
 //affects them once clothing is factored in. ~Errorage
@@ -798,11 +798,11 @@
 	else
 		to_chat(src, "<span class='warning'>You don't have the dexterity to do this!</span>")
 	return
-/mob/living/proc/can_use_guns(var/obj/item/G)
+/mob/living/proc/can_use_guns(obj/item/G)
 	if (G.trigger_guard != TRIGGER_GUARD_ALLOW_ALL && !IsAdvancedToolUser())
 		to_chat(src, "<span class='warning'>You don't have the dexterity to do this!</span>")
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 /mob/living/carbon/proc/update_stamina()
 	if(staminaloss)