Manufactured by multiple subcontractors, with "fxo" (Haenel) and "cos" (Merz-Werke) markings on the trigger housing, the MP40 was a refined and streamlined successor to the MP38, making extensive use of metal stampings and synthetic materials to make a weapon robust enough to withstand the stress of war while being simple enough to manufacture to keep up with the demand. Nearly every armed branch and paramilitary organization in Germany made use of the MP40, and many also found their way into the hands of opposition forces such as the French Resistance and Poland's Home Army, making it one of the signature weapons of the war. Blade front and two-leaf rear sights, with "eagle/37" (Haenel) and "WaA254" proofs on the receiver tube, "42" date on the endcap. the latter also dated "41". Fitted with a set of brown Bakelite side panels and an under-folding stock.