The best replacement for no shotgun is no xplode.

The best alternatives to no shotgun are rated as following:
★★★★★  no xplode
★★★  white flood
★★  superpump 250
★★  superpump max
★★  assault
★★  nano vapor
★  no explode
★  black powder
★  bullnox
★  no synthesize
★  animal pump
★  superpump
  shock therapy
  animal rage
  1mr
  super pump 250
  dark rage
  cellucor c4
  12 gauge shotgun

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Speaking about no shotgun, one probably shouldn't forget about nitrix.

Other search terms related to no shotgun and their ratings are:
★★★★★ nitrix
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no shotgun
no xplode
white flood