Medium 'Mechs mass from 40 through 55 tons. They are the most common type, with an average mix of armor, firepower, and speed. They serve in the widest range of roles, from scout to combat to support effectively. They are jacks of all trades and masters of none; they are too slow to pursue lighter 'Mechs and too weak to oppose heavier ones.
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ASN-21 Assassin | 40 Tons | |
| 118.8 kph | 72 Armor | year: 3025 | |
| 1 Medium Laser 1 SRM-2 1 LRM-5 |
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| A fast medium scout 'Mech with a variety of weapons. | |||
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BE0-12 Beowulf | 45 Tons | |
| 1 Large Pulse Laser 2 ER Medium Lasers |
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| A superior medium EW scout. Fast, well-armored and packing a punch. | |||
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BJ-1 Blackjack | 45 Tons | |
| 64.8 kph | 136 Armor | year: 3025 | |
| 2 AC/2 4 Medium Lasers |
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| A slow but tough medium combat Mech. Effective at anti-aircraft roles. | |||
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PXH-1 Phoenix Hawk | 45 Tons | |
| 97.2 kph | 128 Armor | year: 3025 | |
| 1 Large Laser 2 Medium Lasers 2 Machine Guns |
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| The best 3025 medium scout. Good armor, nice weapons mix, good mobility. It will be missed. | |||
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VND-1R Vindicator | 45 tons | |
| 64.8 kph | 144 Armor | year: 3025 | |
| 1 PPC 1 LRM-5 1 Medium Laser 1 Small Laser |
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| An unexciting multipurpose 'Mech but easily mass-produced. | |||
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CN9-A Centurion | 50 Tons | |
| 64.8 kph | 136 Armor | year: 3025 | |
| 1 AC/10 1 LRM-10 2 Medium Lasers |
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| A slow yet well armed common medium combat Mech. | |||
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CRB-27 Crab | 50 Tons | |
| 2 Large Lasers 1 Medium Laser 1 Small Laser |
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| The favored medium combat Mech of the Star League. Still serves with ComStar and the Word of Blake. | |||
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HBK-4G Hunchback | 50 Tons | |
| 63.5 kph | 160 Armor | year: 3025 | |
| 1 AC/20 2 Medium Lasers 2 Small Lasers |
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| A true 'smasher' medium Mech with a heavy autocannon. | |||
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RJN101-A Raijin | 50 Tons | |
| 1 ER PPC 3 Medium Pulse Lasers 1 SRM-6 1 Streak SRM-2 |
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| An excellent all-purpose Mech. | |||
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TBT-5N Trebuchet | 50 Tons | |
| 86.4 kph | 120 Armor | year: 3025 | |
| 2 LRM-15s 3 Medium Lasers |
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| A common long range support 'Mech. | |||
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BSW-X1 Bushwhacker | 55 Tons | |
| 1 AC/10 2 LRM-5s 1 ER Large Laser 2 Machine Guns |
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| An experimental combat 'Mech, quickly becoming a mainstay of the Lyran Alliance. | |||
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GRF-1N Griffin | 55 Tons | |
| 81.5 kph | 152 Armor | year: 3025 | |
| 1 PPC 1 LRM-10 |
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| A vintage long-range combat 'Mech that still serves faithfully. | |||
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SCP-1N Scorpion | 55 Tons | |
| 97.2 kph | 112 Armor | year: 3025 | |
| 1 PPC 1 SRM-6 |
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| A truly sucky medium combat 'Mech. I have seen them put to good use, though. | |||
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SHD-2H Shadow Hawk | 55 Tons | |
| 86.4 kph | 152 Armor | year: 3025 | |
| 1 AC/5 1 LRM-5 1 SRM-2 1 Medium Laser |
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| An average combat 'Mech with a well-rounded variety of weapon systems. | |||
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WVR-6R Wolverine | 55 Tons | |
| 86.4 kph | 152 Armor | year: 3025 | |
| 1 AC-5 1 SRM-6 1 Medium Laser |
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| A medium recon 'Mech with respectable weapons, average speed and heavy armor. | |||