PDW more less effective?

What do you know about PDW?
personal defense weapon or as known as PDW is a compact semi-automatic or fully-automatic firearm similar in most respects to a submachine gun, but firing an (often proprietary) armor-piercing round, giving a PDW better range, accuracy and armor-penetrating capability than submachine guns, which fire pistol-caliber cartridges.

PDWs were developed during the late 1980s for non-combatant troops as compact automatic weapons that could defeat enemy body armor. The earliest PDWs marketed as such were the Heckler & Koch MP5K-PDW and the GG-95 PDW.

as their smaller size and lighter weight would be less of an encumbrance to a person whose primary function on the battlefield was not frontline fighting.

Ammunition

Typical PDWs use small-caliber, high-velocity pistol bullets similar to miniaturized rifle rounds, which are capable of penetrating soft body armor up to Level IIIA (ballistic armor level). PDWs are otherwise similar to submachine guns in most respects, and are often classified as such.

Modern personal defense weapons

• Colt MARS - (5.56x30mm MARS)
• FN P90 - (5.7x28mm)
• Heckler & Koch MP7 - (4.6x30mm)

• Knight's Armament Company PDW - (6x35mm KAC)

• Magpul PDR (5.56x45mm NATO)

Hope it can change your Heavy loaded weapon fanaticism... it's all about functionality and simplicity. Keep on shooting guy's.