A Heavy Barrel is a weapon attachment used to increase a weapon's accuracy by reducing barrel whip.
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The Heavy Barrel is a secondary attachment that increases long range accuracy during aimed fire but increases the weapon's vertical recoil in Battlefield 3.
Match Rounds do not increase the overall damage of the weapon, but they do increase the speed of the rounds in certain weapons.
The 1.04 patch, first released on 27 March 2012, now makes the Heavy Barrel, paired with Match Rounds, increase the maximum range of the weapon and increases the aimed accuracy. The minimum and maximum damages are unchanged. A small hip accuracy penalty was added to represent the added weight of the accessory but the exact penalty amount is weapon specific.
The Heavy Barrel is a weapon attachment featured in Battlefield 4. It increases a weapon's long range accuracy, but increases its recoil.