Polymer lower receivers are becoming increasingly popular in the world of firearms. Several advantages come with using a polymer lower receiver. First, they are much lighter than their metal counterparts. This can be a major advantage when trying to reduce the overall weight of your firearm. Second, they are often more affordable than metal lowers. This can be a great option for those on a budget. Finally, polymer receivers tend to be more corrosion-resistant than metal receivers. This is an important consideration if you plan on using your firearm in tough conditions or exposing it to the elements regularly.
Overall, polymer lower receivers offer some clear advantages over their metal counterparts. However, it is important to keep in mind that they are not necessarily better in all respects. Each type of receiver has its strengths and weaknesses, so it is important to choose the one that is right for your specific needs.