Aye. I get unified gear and the unified Armour styles.

However we could have a few unnumbered sons who squads got mixed up due to losses, or met on battlefields and worked together out of requirements. Mean same gear, mk X armour, just stalker, bolt and assault rifles are available. 

That's not the biggest stretch?

Bolt pistols are standard marine issue. No special. 
Same with blade and Grenades. 

[@Jbcool]