Geissele Super Modular Rail MK4 Mod 0 By Matt on December 22, 2014 in Guns Geissele Automatics has announced that their Super Modular Rail (SMR) MK4 Mod 0 will be available again in 2015. The MK4 is one of lightest and most popular versions of the SMR. It will be nice to see it available again. Share this:TwitterFacebook Geissele, Geissele Automatics
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