BUR #16040 has been approved by @nonamethanks.
create alias colt_smg -> colt_9mm_smg
create alias ro635 -> colt_9mm_smg
The submachine gun is also best known as the Colt Model 635 or Colt M635. Why do we have two tags for a single type of named gun? This is analogous to previous issue regarding Adaptive Combat Rifle. Sometimes Girls' Frontline character naming can be inaccurate (e.g. previous topic #22738 regarding DP-27), or in some cases using the less-known unofficial weapon name.
If you have another aliasing option by using the two names stated on the Wikipedia article, I would also agree with your alternate options. I'm hoping the site staff and other more-experienced users than me to respond and take action to weapon-related BURs.
Please check out topic #23600 too regarding weapon tags.
Updated