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Suppressors trap, redirect or alter gas expended from a discharged cartridge, both in front of and behind the expended bullet. This will effect your weapon’s operation, and to which extent depends on the weapon and ammunition used, as well as the suppressor’s design. Suppressors cause back pressure, although newer designs cause much less than what they once did. How and when it occurs is critical.
Pistols suffer the opposite effect. Suppressors lessen the recoil impulse required to make your pistol cycle. Some require recoil boosters to ensure proper operation. Low-powered ammunition can turn your semi-auto into a single shot. Suppressors can be attached to revolvers, but much of the trapped gas just goes out the cylinder gap, lessening efficiency.