The key weakness with these remote weapons is the demand for critical space.
For ammunition-based weapon, I'd be tempted to give them 1 load of weaponry inherently, so it doesn't need crit space for that. So each of the weapons for the Inner Sphere get the listed shots 'free' to represent an existing battery pack connected to them (or an on-mount weapons box). For energy weapons using only a 3 kg battery pack, you might see multiple battery packs linked together (or larger
Power Packs since the Mech can carry them much easier).
Would that battery pack be able to charge from the Mech's reactor? This way it only uses power from the battery pack when the Mech is shut down (and once the reactor is back online, the battery recharges easily). That could be a primary use for these weapons, a basic anti-infantry defense when the Mech is overheated and shut down.
Would a shot from each of these if it hits internal structure, be enough to roll for a critical? You might see a light Mech with a few of these weapons used for crit-seeking instead of damage.
But overall, none of these weapons are a match for existing Inner Sphere 3025 weaponry. I put your chart below, and added the Inner Sphere 3025 Small Laser, Medium Laser, Machine Gun, and Flamer for comparison
Sample mounts:
Name (IS Lasers) Tech TL Type Range Dmg Wt/Reload Shots C TW Range TW Dmg TW Heat TW Wt. AI Dmg Barrels
Small Laser IS/Clan (D) Mech 3 3 500 kg/- N/A 1 3 3 1 0.5 ? 1 (Forgot the AI damage for ISSL)
Medium Laser IS/Clan (D) Mech 9 5 1000 kg/- N/A 1 9 5 3 1 ? 1 (Forgot the AI damage for ISML)
Machine Gun IS/Clan (D) Mech 3 2 500 kg/5 kg N/A 1 3 2 0 0.5 ? 1 (Forgot the AI damage for ISMG)
Flamer IS/Clan (D) Mech 3 2 500 kg/- N/A 1 3 2 0 0.5 ? 1 (Forgot the AI damage for ISFlamer)
Support Laser (Semi-Portable) IS/Clan (D) Medium/Support (E) 3 0.61 40 kg/3 kg 21 2 2 1 1 0.25 1 2
Support Laser IS/Clan (D) Medium/Support (E) 3 0.84 72 kg/3 kg 15 2 2 2 2 0.5 1 2
Support Pulse Laser IS/Clan (E) Medium/Support (E)B 3 0.81 150 kg/3 kg (21/4) 2 3 1 1 0.5 1d6 1
Support Laser (ER, IS) IS (E) Medium/Support (E) 4 0.84 110 kg/3 kg 10 2 4 1 2 0.5 1 1
Support Pulse Laser (Heavy) IS/Clan (E) Medium/Support (E)B 4 0.98 300 kg/3 kg (18/3) 4 4 1 2 1 1d6 1
Support Laser (Heavy) IS/Clan (D) Medium/Support (E) 5 1.47 300 kg/3 kg 7 3 5 1 2 1 1 1
Support Laser (ER Heavy, IS) IS (E) Medium/Support (E) 6 1.05 250 kg/3 kg 7 4 6 1 2 1 1 1
Name (Clan Lasers) Tech TL Type Range Dmg Wt/Reload Shots C TW Range TW Dmg TW Heat TW Wt. AI Dmg Barrels
Support Pulse Laser (Semi-Port) Clan (F) Medium/Support (E) 2 0.55 40 kg/3 kg (25/2) 2 2 1 1 0.25 1 2
Support Laser (ER, Semi-Port) Clan (F) Medium/Support (E) 3 0.7 25 kg/3 kg 15 2 2 2 2 0.25 1 3
Support Laser (Hvy, Semi-Port) Clan (F) Medium/Support (E) 3 1.05 150 kg/3 kg 10 3 3 1 1 0.5 1 1
Support Laser (ER, Clan) Clan (F) Medium/Support (E) 4 1.05 100 kg/3 kg 10 2 4 1 2 0.5 1 1
Support Laser (Ultra-Heavy) Clan (F) Medium/Support (E) 5 1.72 250 kg/3 kg 5 4 5 2 2 1 1 1
Support Laser (ER Heavy, Clan) Clan (F) Medium/Support (E) 7 1.26 240 kg/3 kg 7 3 7 1 2 1 1 1
Name (PPCs) Tech TL Type Range Dmg Wt/Reload Shots C TW Range TW Dmg TW Heat TW Wt. AI Dmg Barrels
Particle Cannon (Semi-Portable) IS/Clan (D) Medium/Support (E) 2 0.72 40 kg/3 kg 25 2 2 1 1 0.25 1 1
Particle Cannon (Support) IS/Clan (D) Medium/Support (E) 3 1.58 1,800 kg/25 kg* 5 3 2 2 1 1 1
* The Support Particle Cannon is weighted as a vehicle in Tech Manual. Reverse engineering, I estimated a weight of 400 kg for the weapon itself.
Name (Flamers) Tech TL Type Range Dmg Wt/Reload Shots C TW Range TW Dmg TW Heat TW Wt. AI Dmg Barrels
Flamer (Man Portable) IS/Clan (C) Medium/Support (E)F 0 0.55 15 kg/8.4 kg 12 1E 0 1 1 0.25 1 1
Flamer (Heavy) IS/Clan (C) Medium/Support (E)F 0 0.79 25 kg/2.9 kg 3 2 0 2 2 0.5 2 2
Needler, Support (Firedrake) IS (D) Medium/Support (B)F 1 1.2 25 kg/ 3 kg (30/3) 2 1 1 1 0.5 1 1