Adjustable Combat Stock

i recently bought a bt4-combat
and i want to upgrade the
barrel, stock, and sight rail
but all the products say "model 98"

to be exact,
the barrels are called
"BT 16 Model 98 Barrel Kit"
"BT 16 A5 Barrel Kit"
"BT 16 Spyder Barrel Kit"

the barrel says
"Liberty Model 98 M4 ACT Car Stock Black"

and the sight rail says
"BT Model 98 Adjustable Sight Rail"

i'm not sure if these products are comaptible
with the bt4 gun

all products are from
www.paintball-discounters.com