Strike Industries Polymer FSA Folding Stock (1913)

The Strike Industries Polymer FSA Folding Stock is the budget version of the FSA family, using a polymer body and a polymer-on-steel-pin hinge in place of the steel-hinge construction on the FSA Single Folder Stock. Pricing lands at roughly half the steel-hinge variant, which makes it the cheapest universal 1913 folding stock at acceptable build quality.

The trade-offs versus the steel-hinge FSA are real: more flex under cheek pressure, less rigid lockup in the extended position, and no aluminum or steel end pieces. For a range gun, a budget host build, or a backup setup it is more than enough. For a duty role, an SBR that will see hard use, or a host with significant cheek-weight loading from a magnified optic, step up to the FSA Single Folder Stock or the Magpul UCS.

Mount is the same universal 1913 Picatinny rear interface as every other stock in this guide. The hinge is ambidextrous, so the fold direction can be configured at install. The buttplate is rifle-spec, meaning this is an SBR-only product.