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30cal 700mm M3 Impact - Barrel Tensioner or Harmonic Barrel Tuner ???? The $200 Dollar Question

I am going to buy either a Tensioner or a harmonic Barrel tuner for my M3 30cal Impact Sniper
Which is best for which situations and why?
I did not get a chance to test the shrouded .30 vs the tensioned .30 I went straight for the tensioned kit from fx. I have had great sucess with it, no POI shift, most slugs shoot well, all pellets have shot well aside from apolos. The slugs would shoot better if using a better magazine like the hunterTACtical or the orioniguana hunter.
 
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