Hello, wonderful airsoft community of Paraguay

I bought an airsoft sniper rifle and tried to remove speed brake, but seems like there's nothing but a unused screw thread in the air nozzle despite the review said there is a speed brake attatched in rifle

I never bought an brand new airsoft from a shop before and don't know other speed brake type except the slotted screw one, so thought I could've missed something. should I do any additional work to increase train speed, or just simply replace the spring?Thank you