Captain Oxygen
The end of one combo is the beginning of another
Sand Grenade, Rifle Shot, and Unload are all unbreakable.
EX Sand Grenade can lead into another EX Sand Grenade, which you finish with either another sand grenade or EX Rifle Shot. Ending with rifle shot sends em away from you while sand grenade ends it with them close to you.
F1 and B1 can go into EX Sand Grenade for an unbreakable 50/50.
Whiff punishing with normals like F3 and Stand 2 can go into EX Sand Grenade.
Since EX Sand Grenade is + on block, if you miss a whiff punish/they block the 50/50 your still at advantage.
F2 and Stand 3 have enough hitstun to go into EX Unload which combos into Normal/EX Rifle Shot.
32 , F1(32) and F2(42) are all unbreakable because the last hits are projectile.
You can confirm into unbreakable Combos with MB Rifle Swing.