They mostly have beam weapons, but also some AMMs that go at 77 000 km/s. Sometimes they ram, but usually only when either out of AMMs or if their ships doens't ahve any weapons on board.
The largest spinal laser I can build doesn't fit on fighters, as it weighs 400 tons, so that instead I opted for a large, but not as large, 35cm laser. It can fire every 3200 seconds, but hopefully a large volley of these will be enough to wipe out enemy ships. I expect that it will, as I don't believe I've ever observed one of their ships with more than 12 layers of armor, meaning that 20 damage from each shot (assuming it hits) will reach the target.
This is the best I can do at the moment, although I should probably design a smaller laser so I can get it to go faster:
Flavia class Strikefighter 485 tons 25 Crew 190 BP TCS 9.7 TH 192 EM 0
19793 km/s Armour 1-5 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 5
Maint Life 3.37 Years MSP 24 AFR 18% IFR 0.3% 1YR 3 5YR 48 Max Repair 60 MSP
Intended Deployment Time: 3 months Spare Berths 2
Cervidus Dynamics 64 EP Inertial Fusion Drive (3) Power 64 Fuel Use 140.01% Signature 64 Exp 20%
Varus Weapon Systems 35cm C0.05 Far Ultraviolet Laser (1) Range 200 000km TS: 19793 km/s Power 32-0.05 RM 5 ROF 3200 32 32 32 32 32 26 22 20 17 16
Panthera & Naevius Fire Control S00.5 100-4000 (FTR) (1) Max Range: 200 000 km TS: 16000 km/s 95 90 85 80 75 70 65 60 55 50
Iustinianus Solid-core Anti-matter Power Plant PB-1.3 (1) Total Power Output 2.08 Armour 0 Exp 25%
This design is classed as a Fighter for production, combat and maintenance purposes
EDIT: Their ships are currently in the solar system, and I'd rather not take my chances that they'll come over and blow me. Perhaps next time, if I get another chance.