diff --git a/code/modules/cargo/blackmarket/blackmarket_items/ammo.dm b/code/modules/cargo/blackmarket/blackmarket_items/ammo.dm
index dcc5c56b93c2..39afd2dd5328 100644
--- a/code/modules/cargo/blackmarket/blackmarket_items/ammo.dm
+++ b/code/modules/cargo/blackmarket/blackmarket_items/ammo.dm
@@ -51,12 +51,24 @@
 	name = "Eoehoma .299 Caseless Magazine"
 	desc = "A 30 round magazine for the E-40 Hybrid Rifle."
 	item = /obj/item/ammo_box/magazine/e40
+	pair_item = /datum/blackmarket_item/ammo/c299
 
 	price_min = 750
 	price_max = 1250
 	stock = 6
 	availability_prob = 0
 
+/datum/blackmarket_item/ammo/c299
+	name = "Eoehoma .299 Caseless ammo box"
+	desc = "This ammunition for the E-40 Hybrid Rifle is probably worth more than the people you're shooting it at."
+	item = /obj/item/ammo_box/c299
+
+	price_min = 250
+	price_max = 500
+	stock_min = 4
+	stock_max = 8
+	availability_prob = 0
+
 /datum/blackmarket_item/ammo/saber_mag
 	name = "Saber 9mm SMG Magazines"
 	desc = "Magazines for use in the Saber 9mm SMG. No, they don't work as swords."
diff --git a/code/modules/projectiles/ammunition/ballistic/rifle.dm b/code/modules/projectiles/ammunition/ballistic/rifle.dm
index 786005aa5ca1..cd38ed9f490f 100644
--- a/code/modules/projectiles/ammunition/ballistic/rifle.dm
+++ b/code/modules/projectiles/ammunition/ballistic/rifle.dm
@@ -85,8 +85,8 @@
 	bullet_per_box = 20
 
 /obj/item/ammo_casing/caseless/c299
-	name = ".229 Eoehoma caseless bullet casing"
-	desc = "A .229 Eoehoma caseless bullet casing."
+	name = ".299 Eoehoma caseless bullet casing"
+	desc = "A .299 Eoehoma caseless bullet casing."
 	icon_state = "caseless"
 	caliber = ".299 caseless"
 	projectile_type = /obj/projectile/bullet/c299
diff --git a/code/modules/projectiles/boxes_magazines/ammo_boxes.dm b/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
index e8e5c59c9c65..70f5a73b6855 100644
--- a/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
+++ b/code/modules/projectiles/boxes_magazines/ammo_boxes.dm
@@ -519,3 +519,10 @@
 	icon_state = "a44roum-hp"
 	ammo_type = /obj/item/ammo_casing/a44roum/hp
 	max_ammo = 50
+
+/obj/item/ammo_box/c299
+	name = "ammo box (.299 Eoehoma caseless)
+	desc = "A box of .299 Eoehoma caseless, for use with the E-40 hybrid assault rifle."
+	icon_state = "229box"
+	ammo_type = /obj/item/ammo_casing/caseless/c299
+	max_ammo = 120
diff --git a/code/modules/projectiles/boxes_magazines/external/rifle.dm b/code/modules/projectiles/boxes_magazines/external/rifle.dm
index 781641a6eef1..6065450a0e0f 100644
--- a/code/modules/projectiles/boxes_magazines/external/rifle.dm
+++ b/code/modules/projectiles/boxes_magazines/external/rifle.dm
@@ -119,7 +119,7 @@
 	multiple_sprites = AMMO_BOX_FULL_EMPTY
 
 /obj/item/ammo_box/magazine/e40
-	name = "E-40 magazine (.229 Eoehoma caseless)"
+	name = "E-40 magazine (.299 Eoehoma caseless)"
 	icon_state = "e40_mag-1"
 	base_icon_state = "e40_mag"
 	ammo_type = /obj/item/ammo_casing/caseless/c299
diff --git a/code/modules/projectiles/guns/ballistic/assault.dm b/code/modules/projectiles/guns/ballistic/assault.dm
index bdabf0a5bda9..3342d60e2113 100644
--- a/code/modules/projectiles/guns/ballistic/assault.dm
+++ b/code/modules/projectiles/guns/ballistic/assault.dm
@@ -141,7 +141,7 @@
 
 /obj/item/gun/ballistic/automatic/assault/e40
 	name = "\improper E-40 Hybrid Rifle"
-	desc = "A Hybrid Assault Rifle, best known for being having a dual ballistic/laser system along with an advanced ammo counter. Once an icon for bounty hunters, age has broken most down, so these end up in collector's hands or as shoddy Frontiersmen laser SMG conversions when in their inheritted stockpiles. But if one were to find one in working condition, it would be just as formidable as back then. Chambered in .229 Eoehoma caseless, and uses energy for lasers."
+	desc = "A Hybrid Assault Rifle, best known for being having a dual ballistic/laser system along with an advanced ammo counter. Once an icon for bounty hunters, age has broken most down, so these end up in collector's hands or as shoddy Frontiersmen laser SMG conversions when in their inheritted stockpiles. But if one were to find one in working condition, it would be just as formidable as back then. Chambered in .299 Eoehoma caseless, and uses energy for lasers."
 	icon = 'icons/obj/guns/manufacturer/eoehoma/48x32.dmi'
 	lefthand_file = 'icons/obj/guns/manufacturer/eoehoma/lefthand.dmi'
 	righthand_file = 'icons/obj/guns/manufacturer/eoehoma/righthand.dmi'
diff --git a/code/modules/projectiles/projectile/bullets/rifle.dm b/code/modules/projectiles/projectile/bullets/rifle.dm
index 0ea5a8557c8d..0d04eaf6e7ec 100644
--- a/code/modules/projectiles/projectile/bullets/rifle.dm
+++ b/code/modules/projectiles/projectile/bullets/rifle.dm
@@ -69,7 +69,7 @@
 // .299 Eoehoma Caseless (E-40)
 
 /obj/projectile/bullet/c299
-	name = ".229 Eoehoma caseless bullet"
+	name = ".299 Eoehoma caseless bullet"
 	damage = 20
 	armour_penetration = 10