Tsui over at Prime Airsoft has dropped me a line to let us know that they have added a new product to their webpage today. New up is a M60E4/Mk43 Mod1 style RIS unit for the TOP M60 series.
The real life MK43 Mod1 configurations have been field tested by units such as SEAL Team Eight, Special Boat Team 20 and U.S. Army SF 5th Group but to make a complete replica you’ll need to grab yourself a railed top cover too (ref: US Ordnance Inc.).