recoil is a function of the weight of the bullet and the weight of the powder/primergasses.
over simplifyed if they all go out the front(like most suppressors) then total recoil is the same (over simplifyed)
if the high pressure gasses are ejected at 90degree to the bore then their net effect on recoil is gone.
if those high pressure gasses start being directed rearward they then start to counteract the recoil of the weight of the projectile.
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