Hop Up Rubbers/Buckings

Hop-up Buckings (rubbers) are made of rubber. These tend to freeze quickly in cold weather or when fired in full auto.
Maple Leaf has released the Silicone rubber variant for this problem. These are very suitable during cold temperatures (winter period).

So if you like to play with your GBB gun during colder temperatures, it is best to use a Silicone rubber bucking in your airsoft gun!