The Scout Biker Sergeant’s bolt pistol can be replaced with one of the following:

• ◦1 Astartes chainsword
• ◦1 boltgun
• ◦1 combi-weapon
• ◦1 hand flamer
• ◦1 grav-pistol
• ◦1 inferno pistol
• ◦1 plasma pistol
• ◦1 storm bolter
• ◦1 power fist
• ◦1 power weapon
• ◦1 thunder hammer

Any number of models can each have their twin boltgun replaced with 1 Astartes grenade launcher.