diff --git a/code/modules/research/designs/mechfab_designs.dm b/code/modules/research/designs/mechfab_designs.dm
index 7ae1195b9106..d38be97cb29c 100644
--- a/code/modules/research/designs/mechfab_designs.dm
+++ b/code/modules/research/designs/mechfab_designs.dm
@@ -518,11 +518,13 @@
 	design_name = "AC 10"
 	id = "mech_lmg_heavy"
 	build_path = /obj/item/mecha_parts/mecha_equipment/weapon/ballistic/lmg_heavy
+	materials_base = list(MAT_STEEL = 12000, MAT_GLASS = 4000, MAT_PLASTIC = 3000, MAT_SILVER = 1500, MAT_COPPER = 4000)
 
 /datum/design/science/mecha/gauss_rifle
 	design_name = "Gauss Rifle"
 	id = "mech_gauss_rifle"
 	build_path = /obj/item/mecha_parts/mecha_equipment/weapon/ballistic/gauss_rifle
+	materials_base = list(MAT_STEEL = 16000, MAT_GLASS = 8000, MAT_PLASTIC = 4000, MAT_SILVER = 3500, MAT_COPPER = 8000)
 
 /datum/design/science/mecha/rigged_lmg
 	design_name = "Jury-Rigged Machinegun"