Avanceret M4 R-Hop Arm Outdoor which allows you to attach

which allows you to attach red dot sights etc

Like the other Glock's

The MOA on the scope here is 1/4 MOA per click - and it can be moved a total of 90 MOA both up and down and to the sides

This is what you get with the Gamo Swarm Magnum Pro 10X Gen3i:

Avanceret M4 R-Hop Arm Outdoor which allows you to attachAirtech Studios is known for making small but really sensible upgrades! Here we have an R Hop Setup where you avoid having to cut and adjust your standard arm. Airtech Studios R HOP arm is designed to be a direct drop in upgrade that provides perfect (TDC) (Top Down Centre) pressure on the rubber. Fits all TM style 3 gear hop up chambers such as: G&G Lonex G&P Airsoft Pro Tokyo Marui