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where the cartridge aperture block is held by a narrow transverse shim (attached to the block by a hidden screw) and then by a broader flat fillet dovetailed on each side into the feed cover plate
- Chest microphone still wrapped in cardboard box
It was originally intended to function for between two and five years
several forthcoming books in different series will address other weapons
A wonderful piece of Russian and Firearms history
Original U.S. Vietnam War Helicopter Pilot Gentex SPH-4 Helmet Dated 1969 - Size X-Large German Replica where the cartridge aperture blockOriginal Item: Only One Available. This is a United States Helicopter Flight Helmet type SPH 4 made by Gentex. The helmet is in overall excellent, complete condition with the liner, headset (speakers detached), clear visor and boom microphone. This is a rare Vietnam era original helicopter helmet in wonderful complete condition! The Sound Protective Helmet 4 (SPH 4) is a derivative of the US Navy SPH 3 and was used by the US Army since 1970. The SPH 4