Polymer AR15 lowers can be easily cleaned with a mild soap and water solution. Be sure to avoid using harsh chemicals or solvents that could potentially damage the polymer finish. A soft brush or cloth can be used to clean any remaining dirt or debris, and then a dry cloth should be used to wipe down the entire surface area. Once the lower is clean and dry, it is ready for assembly.
If you are looking to upgrade your AR15 lower, there are a few things you will need to consider. The first is the type of trigger you want. There are two main types of triggers- single-stage and two-stage. Single-stage triggers are typically lighter and crisper, while two-stage triggers have a bit more of a “mushy” feel. You will also need to decide on the type of grip you want. There are many different styles of grips available, so you should take some time to find one that fits your hand size and shooting style.
Finally, you will need to select a stock. Stocks come in a variety of materials, colors, and designs, so you should have no problem finding one that meets your needs.