Here is my idea:

Pros:
+ 20% Damage vs. Buildings.
+ 20% Critical hit Chance.
+ 10% Damage vs. Players.
+ On Kill: reduces recharge time by 5% to maximum of 8 kills (40%).
+ On hit: Victim loses 33% cloak.
+ On hit: Victim loses 20% Ubercharge
+ On hit: +10% charge.
+ Can open 2 crates.
+ On Kill: +15 maximum health
+ On kill: +5% move speed
+ On kill: + 0.2 sec charge time.
+ On Kill: +10% Crush
+ Crush activates Ubercharge and 100% critical chance for 8 seconds.
- 40% damage income from melee wapons

Cons:
- 1 second charge time.
- 20% melee speed.
- 20% move speed.
- 25 health on wearer.
- 33% charge recharge time.
- After opening 2 crates, the weapon is broken = unusable.
- Requires 1 reclaimed metal to repair.