Fix

code/game/content/factions/corporations/nanotrasen/guns/nt_pmd.dm

@@ -52,8 +52,9 @@
 
 /obj/item/gun/projectile/energy/nt_pmd/service_revolver
 	name = "service weapon"
-	icon_state = "service_grip"
-	#warn rename icon states, move icon over, add icon states to firemodes
+	icon = 'icons/content/factions/nanotrasen/items/guns/nt_pmd/service_revolver.dmi'
+	icon_state = "service"
+	base_icon_state = "service"
 	desc = "An anomalous weapon, long kept secure. It has recently been acquired by Nanotrasen's Paracausal Monitoring Division. How did it get here?"
 	damage_force = 5
 	slot_flags = SLOT_BELT
@@ -70,3 +71,8 @@
 		/datum/firemode/energy/nt_pmd/service_revolver/pierce,
 		/datum/firemode/energy/nt_pmd/service_revolver/charge,
 	)
+	item_renderer = /datum/gun_item_renderer/overlays{
+		count = 4;
+		use_single = TRUE;
+		independent_firemode = TRUE;
+	}

code/game/content/factions/corporations/nanotrasen/guns/nt_protomag.dm

@@ -22,7 +22,6 @@
 
 //* Sidearm *//
 
-#warn impl all ; materials
 
 /obj/item/gun/projectile/ballistic/magnetic/nt_protomag/sidearm
 	name = "protomag sidearm"
@@ -51,9 +50,17 @@
 		GUN_COMPONENT_POWER_UNIT = 1,
 	)
 
-//* Rifle *//
+	materials_base = list(
+		/datum/prototype/material/steel::id = 3500,
+		/datum/prototype/material/glass::id = 500,
+		/datum/prototype/material/silver::id = 750,
+		/datum/prototype/material/gold::id = 350,
+		/datum/prototype/material/copper::id = 750,
+		/datum/prototype/material/diamond::id = 250,
+		/datum/prototype/material/lead::id = 250,
+	)
 
-#warn impl all ; materials
+//* Rifle *//
 
 /obj/item/gun/projectile/ballistic/magnetic/nt_protomag/rifle
 	name = "protomag rifle"
@@ -83,3 +90,13 @@
 		GUN_COMPONENT_ACCELERATION_COIL = 2,
 		GUN_COMPONENT_POWER_UNIT = 2,
 	)
+
+	materials_base = list(
+		/datum/prototype/material/steel::id = 5000,
+		/datum/prototype/material/glass::id = 1500,
+		/datum/prototype/material/silver::id = 1500,
+		/datum/prototype/material/gold::id = 800,
+		/datum/prototype/material/copper::id = 1200,
+		/datum/prototype/material/diamond::id = 350,
+		/datum/prototype/material/lead::id = 450,
+	)

code/modules/projectiles/guns/gun_component/particle_array.dm

@@ -20,8 +20,7 @@
  * Consume next projectile hook
  */
 /obj/item/gun_component/particle_array/proc/consume_next_projectile(datum/gun_firing_cycle/cycle) as /obj/projectile
-	#warn cycle charge cost mod
-	var/effective_power_use = base_energy_cost
+	var/effective_power_use = base_energy_cost * cycle.next_projectile_cost_multiplier
 	if(effective_power_use)
 		if(!installed.modular_use_checked_power(src, effective_power_use))
 			return GUN_FIRED_FAIL_EMPTY

code/modules/projectiles/guns/gun_component/particle_array/particle_beam.dm

@@ -5,7 +5,7 @@
 	name = /obj/item/gun_component/particle_array::name + " (particle beam)"
 	desc = "A particle array that emits a damaging beam. Bog-standard, really."
 
-	charge_cost = /obj/item/cell/device/weapon::maxcharge / 8
+	base_energy_cost = /obj/item/cell/device/weapon::maxcharge / 8 * 500
 	considered_lethal = TRUE
 
 	// todo: /obj/projectile/modular_energy/*

code/modules/projectiles/guns/gun_firing_cycle.dm

@@ -74,6 +74,8 @@
 	var/next_dispersion_adjust
 	/// on this iteration, force adjust the angle by this much (pos = cw, neg = ccw); this is in degrees
 	var/next_angle_adjust
+	/// energy cost multiplier for the projectile
+	var/next_projectile_cost_multiplier = 1
 	/// blackboard for modular gun components to use
 	var/list/blackboard
 	/// multiplier to total cooldown after firing cycle
@@ -89,3 +91,6 @@
 	next_angle_adjust = \
 	next_firing_fail_result = \
 		null
+
+	next_projectile_cost_multiplier = \
+		1

code/modules/projectiles/guns/gun_item_renderer.dm

@@ -97,12 +97,14 @@
  */
 /datum/gun_item_renderer/overlays
 	/// total count of overlays, from 1 to amount
+	/// * example: "[base]-[count]"
 	var/count
 	/// add "-empty" overlay when we're empty, instead of adding nothing
 	var/use_empty
 	/// only use the n-th overlay, instead of adding 1 to n
 	var/use_single
-	/// additionally, add "-[firemode]" to the segment
+	/// additionally, add "-[firemode]" to the overlay, before the count
+	/// * example: "[base]-[firemode]-[count]"
 	var/use_firemode
 	/// use gun requested render color on ammo bar
 	var/use_color