The MP5-Xmas is a MP5-adv with a Christmas Skin. In CF Z8, you could only get it with ZP Crates in the Black Market in the 2009 Xmas Patch.
Just like its counterparts, the MP5 has 35/135 ammo, decent rate of fire, recoil, accuracy, and damage. One thing that makes it good is its fast reload speed. Being very versatile and light, it is most useful at close and medium range, but does almost no damage at longer ranges.Also provides a gun with good firing rate, fast reload time and nice damage at CQC and good ammo reserves.