ARP 135 - Mk18 SOPMOD


Welcome to Episode #135 of the AR15 Podcast.

We want to let you know about a new source of cool products!  Go to to pre-order the Huckleberry patch and buy FRN stickers.

Also, the Firearms Radio Network will be at the 2015 BullPup Shoot in Mount Carroll, IL on September 19th. Go to for more info.Main Topic -

Mk18 Clones (SOPMOD Block I and II)

  • How’d Naader get into this?
  • The Airsoft world
  • Evolution of the CQBR/Mk18 program
  • Rails, barrels, accessories
  • Difference between units, branches

CQBR project removed from SOPMOD, taken over by NSWC, Crane, type-classified as the Mk 18 Mod 0.

10.3” barrel, gas port opened up from 1.6 to 1.8mm. 1-piece gas ring instead of 3 rings. Commercial extractor spring + o-ring around extractor.