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Here's my take on a semi-mech, semi-gunline, 100% balanced codex army

Chapter Master
Relic Blade
Storm Shield
Aux Grenade Launcher
185

10 Tactical Marines
Flamer
Missile Launcher
Powerfist+combi-flamer
Razorback w/ Heavy Bolters
245

10 Tactical Marines
Flamer
Missile Launcher
Powerfist+combi-flamer
Razorback w/ Heavy Bolters
245

Terminators
Cyclone Missile Launcher
230

Dreadnought
Missile Launcher
Lascannon
135

10 Assault Squad
2xFlamers
Powerfist
235

10 Devastator Squad
4 Missile Launchers
240

Total: 1505

Need to shave 5 points from somewhere. Maybe remove the stormshield from the Chapter Master?
Also do you reckon a combi-flamer would be superior to a Stormbolter on Razorbacks?

Thanks in advance for the advice!

Many missles,but you would still in need for someting which can get rid of AV14.

What about placing lascannons on the razorbacks?

Or equipping the Assault Marine sarge with a meltabomb?

Or replacing the combi-flamers for combi-meltas for flexibility?