You can grind weapons in Borderlands 2, but it is important to note that the Grinder is a feature introduced in the Pre-Sequel and not in the second installment of the game. In Borderlands 2, you do not have a Grinder to combine and create new weapons.
However, Borderlands: The Pre-Sequel introduces the Grinder as a new gameplay mechanic. The Grinder allows players to combine three items of the same type and rarity to create a new item. This means that you can grind three weapons, class mods, grenade mods, Oz kits, or shields to get a new item in return.
To use the Grinder, you need to find it in Concordia, the main hub town in Borderlands: The Pre-Sequel. Once you locate the Grinder, you can interact with it and access its interface. From there, you can select the three items you want to grind. These items need to be of the same type and rarity, meaning three weapons of the same rarity, three shields, etc.
After selecting the items, you simply press the grind button, and the Grinder will combine them to create a new item. The new item you receive will have a chance to be of a higher rarity than the items you put in. This means that you can potentially obtain a more powerful weapon or item through the grinding process.
It is worth noting that grinding does not guarantee a higher rarity item, and there is an element of randomness involved. Sometimes you may receive an item of the same rarity, or even a lower rarity, than the items you put in. However, there is also a chance to get a legendary or unique item, which can be incredibly valuable and powerful.
In my personal experience with the Grinder, I have found it to be a fun and exciting way to obtain new gear. It adds an extra layer of customization and progression to the game, as you can continuously grind and aim for better loot. It also provides an opportunity to get rid of duplicate or unwanted items, turning them into potentially more useful gear.
The Grinder is a valuable feature in Borderlands: The Pre-Sequel that allows players to experiment with different combinations and potentially obtain more powerful weapons and items. It adds another dimension to the gameplay and enhances the looting experience.