Mec Primer Cover. The MEC Primer Cover is a much-needed accessory for your MEC primer and prevents leaking even on extremely cold days. The MEC COVER works great for all kinds of high-volume shooters. Many times a shooter will get a little extra distance with a shot or two from their load or maybe they just want to be sure they don't spill the last little bit of their primer or they simply want a longer life from their existing load. This cover is an ideal solution for those who want to save their primer. Specifications for Mec Primer Cover 285ML: Mfg Item Num: 285ML Type: RELOADING - SHOTSHELL RELOADING ACCESSORIES Master Model Header: MEC Primer Cover The Mec Primer Cover 285ML is a quality addition to the MEC lineup. For more great deals on Muzzleloading Supplies by MEC please browse our MEC Muzzleloading Supplies page.