Warframe dealing less damage with almost same mods

[Xeteos]

Me and my friend have been testing out our damages together, and although we use the same weapon with almost the exact same mods, I deal less damage. I was using the dread with my friend, and we had the almost the exact same mods. However, when I hit a red crit, I would only hit max 20k damage. My friend was able to reach 40k's on average and even managed to hit 100k red crit. 

Could this have been due to us being different mastery ranks, storyline progress, etc? I am a new player and he has played much longer than me. I honestly feel that I am dealing less damage than I should be. Maybe it's me, but I'm just wondering if there is anything that I'm doing wrong.

Eg. My boltor is dealing 40 damage on body shots against corpus. It has serration (120% damage), stormbringer (90% electricity) and speed trigger (60% fire rate)

[Alcatraz]

Make sure you take off your extinguished dragon key.

[rapt0rman]

Almost the same build or actually the same build? A single mod can make all the difference.

EIther way, no, mastery rank and quest progression don't directly affect your damage.

Also as said above, check for an extinguished dragon key :P

Edited June 15, 2017 by rapt0rman

[PeachyPurpleNova]

Damage is not based on mastery or story progression. Can we clarify that you do not have a dragon key equipped by mistake?

When you say your build is almost the same, what is different? Are your mods all ranked up?

[Wrum]

what mods are different? post your builds.

[Marine027]

As most statetd above already.

Could it be also different mod order, like creating different damge type, hitting different enemy types or parts, like magnetic will do less damage on armor, crit or not.

[PhantomCrosz]

you didn't specify what enemies you and your friend use to do your test. 
enemy armor value play a big part in damage reduction, to get a consistent result you should test it on the same exact enemy

[Arrectius]

Like people already answered it, test it with the same kind of enemy and with the same kind of damage. For example corrosive damage does 75% more damage to ferrite armor and magnetic does half damage to alloy armor, just to say a few examples.

[NeithanDiniem]

Also note, headshots deal more damage than a body shot, typically a x2 multiplier if I'm not mistaken.

[(PSN)mmcareen]

1 mod can make a pretty give difference

the order of your element mods determine your damage type, which some enemies are weak or strong against

headshots also play a part in the damage

if split chamber gives you 2 arrows and you are missing with 1 and his hitting with both

If the G3 bolted you, you'd do less damage against grineer

There are a good few possible reasons.  As said above, best way to get a good answer is post your builds.  Your damage output isn't affected by MR or where you are to in the game.