Gc7a1 or Gc 12 spr help

[Noobieboi]

Hey there all, I’m fairly new to this all. I recently got myself a g&g tgm q5 and found myself wanting more range at the last game, ive been looking into these two rifles.
What I as a newbie have been able to find
Gc7a1
-longer inner barrel (510mm)
-gearbox bearing -8mm ball bearing

Gc 12 spr
-inner barrel length (463mm)
-gear box bearing -8mm oilless

I would love to know what you’re guys thoughts on these are and what you would rather own as a DMR type of rifle. Also if someone could tell me the difference and pros and cons between ball bearing and oilless is please
Thanks all
Andrew

[Styrak]

Barrel length won't make a difference in range.