This expert guide details the RIA Defense RD4P Cobra, a piston-operated rifle developed for military and law enforcement. It covers the extensive R&D process, focusing on heat management solutions like a custom bull barrel and advanced materials. The guide highlights the rifle's unique underwater firing capability, ambidextrous controls, and adjustable gas block, all explained by a lead representative from Rock Island Armory Defense.
This video from RECOILtv features Iain Harrison and Mark Plowman conducting an extreme test of an AR-15 and an AK-47 firing underwater. Using professional commercial diving equipment, the test reveals significant malfunctions in both platforms due to water ingress and overpressure. The analysis highlights the failure points of each rifle under these unique conditions.
This guide details a modification to enable a Glock firearm to fire underwater more effectively. The process involves disassembling the striker assembly and cutting specific slots into the striker spring retaining piece to improve water expulsion. The video demonstrates this on a Glock that has been submerged in saltwater for an extended period, noting minor rust but overall resilience.
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