Abstract: A stock for a firearm includes an attachment member shaped to attach the stock to a firearm, a stock member pivotally attached to the attachment member so that the stock member is pivotable between an aligned position and a folded position, and a stock body. One of the stock member and stock body includes a plurality of stock attachment locations so that the stock member and stock body are connected together at one of the plurality of stock attachment locations.

Abstract: The current application is directed to canister-type water filters that include at least two different types of filter media contained within at least two internal modules. The canister-type water filters to which the current application is directed provide the cost-effectiveness, ease of maintenance, and robustness of currently available canister-style water filters, but provide effective removal of a far broader range of contaminants than currently available canister-style water filters.

Abstract: The multi-filter POE water-filtration systems, to which the current application is directed, employ multiple filter modules that operate, in parallel, to filter input, untreated water. By using parallel filtration by multiple filter modules, relatively high throughput and low pressure losses are obtained. Modules are connected into the filtration system by quick-connect and quick-disconnect features which contribute to ease of use and maintenance. A three-dimensional (“3D”) network-material-based filter medium is used within the multiple filter modules, in certain examples of the multi-flow POE water-filtration system to which the current application is directed. In one example, the multi-filter POE water-filtration system includes four filter modules that filter water in parallel. In other examples, a larger number of filtration modules may be employed and, in still other examples, two or three filtration modules, rather than four, may be employed.

Abstract: The current application is directed to cost-effective and efficient well-water treatment systems that employ both multi-layer filtration and aeration to remove undesirable gasses, such as carbon dioxide, hydrogen sulfide, methane, radon, and volatile organic-compound gasses from input well water as well as particulate contaminants and soluble metal ions, including iron and manganese. The well-water treatment systems to which the current application is directed additionally remove many other types of well-water contaminants.

Abstract: The current application is to multi-canister water-filtration systems with two or more canister-type water filters as well as pressure-monitoring components to allow for the pressure drop across at least one of the canister-type water filters to be monitored and filtration-efficiency degradation detected.