This assembly comprises the components necessary to fabricate a specific firearm receiver through welding. It typically includes metal flats or partially formed pieces that, when joined, create the central structure for the firearm. For example, such a kit might contain pre-cut steel plates and jigs designed to facilitate accurate alignment during the welding process.
The availability of these kits allows individuals to construct firearms at home, potentially offering cost savings compared to purchasing a complete firearm. Historically, these kits gained popularity due to their accessibility and the ability to bypass certain regulations applicable to fully assembled firearms. However, legal restrictions and regulatory oversight of such kits vary significantly by jurisdiction.