GAU Buff - Shooting twice the bullet per bullet (#5065)

# About the pull request

GAU historically has been a terrible option. Quad GAU being such a meme
that it's mostly a joke. What if we doubled the ROF of the GAU?

# Explain why it's good for the game

More options other than rockets/lasers please.


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
balance: GAU RoF doubled
/:cl:

---------

Co-authored-by: Zonespace <[email protected]>

code/modules/cm_marines/dropship_ammo.dm

@@ -166,28 +166,30 @@
 		turf_list += T
 	var/soundplaycooldown = 0
 	var/debriscooldown = 0
+
 	for(var/i = 1 to ammo_used_per_firing)
-		var/turf/impact_tile = pick(turf_list)
 		sleep(1)
-		var/datum/cause_data/cause_data = create_cause_data(initial(name), source_mob)
-		impact_tile.ex_act(EXPLOSION_THRESHOLD_VLOW, pick(GLOB.alldirs), cause_data)
-		create_shrapnel(impact_tile,1,0,0,shrapnel_type,cause_data,FALSE,100) //simulates a bullet
-		for(var/atom/movable/explosion_effect in impact_tile)
-			if(iscarbon(explosion_effect))
-				var/mob/living/carbon/bullet_effect = explosion_effect
-				explosion_effect.ex_act(EXPLOSION_THRESHOLD_VLOW, null, cause_data)
-				bullet_effect.apply_armoured_damage(directhit_damage,ARMOR_BULLET,BRUTE,null,penetration)
-			else
-				explosion_effect.ex_act(EXPLOSION_THRESHOLD_VLOW)
-		if(!soundplaycooldown) //so we don't play the same sound 20 times very fast.
-			playsound(impact_tile, 'sound/effects/gauimpact.ogg',40,1,20)
-			soundplaycooldown = 3
-		soundplaycooldown--
-		if(!debriscooldown)
-			impact_tile.ceiling_debris_check(1)
-			debriscooldown = 6
-		debriscooldown--
-		new /obj/effect/particle_effect/expl_particles(impact_tile)
+		for(var/j in 1 to 2) //rather than halving the sleep, were doubling the bullets shot "bang"
+			var/turf/impact_tile = pick(turf_list)
+			var/datum/cause_data/cause_data = create_cause_data(initial(name), source_mob)
+			impact_tile.ex_act(EXPLOSION_THRESHOLD_VLOW, pick(GLOB.alldirs), cause_data)
+			create_shrapnel(impact_tile,1,0,0,shrapnel_type,cause_data,FALSE,100) //simulates a bullet
+			for(var/atom/movable/explosion_effect in impact_tile)
+				if(iscarbon(explosion_effect))
+					var/mob/living/carbon/bullet_effect = explosion_effect
+					explosion_effect.ex_act(EXPLOSION_THRESHOLD_VLOW, null, cause_data)
+					bullet_effect.apply_armoured_damage(directhit_damage,ARMOR_BULLET,BRUTE,null,penetration)
+				else
+					explosion_effect.ex_act(EXPLOSION_THRESHOLD_VLOW)
+			new /obj/effect/particle_effect/expl_particles(impact_tile)
+			if(!soundplaycooldown) //so we don't play the same sound 20 times very fast.
+				playsound(impact_tile, 'sound/effects/gauimpact.ogg',40,1,20)
+				soundplaycooldown = 3
+			soundplaycooldown--
+			if(!debriscooldown)
+				impact_tile.ceiling_debris_check(1)
+				debriscooldown = 6
+			debriscooldown--
 	sleep(11) //speed of sound simulation
 	playsound(impact, 'sound/effects/gau.ogg',100,1,60)