current rating for SMGs you got:
MUST TRAIN:
UMP9
SR3-MP (sheesh bro you damn lucky getting sr3 this early!)

SR3 can be trained later since it is not easy to make a team for her (and also... she's a 5 star). But she is one of the best SMGs for me personally. Some ppl don't like her recently due to newer SMG coming out, but i really like. Insane damage output even though she's a SMG. She's so strong there's a few megathreads discussing the "whirlwind team strategy" (SR3-MP nick name is Whirlwind) and how to maximise her potential.

UMP9 on the other hand, is quite versatile and have quite good stats for a 4 star. Stun grenades are nowhere near as good as smoke grenades in most situation tho. Still a very worthy SMG.

As for RF, M14 is actually so good that many considered it as an intentional bug created by GF dev to make ppl like RF more. She's the top 5 strongest RF from 2 years ago until now, never getting nerfed. She's low star and easily trainable. And her drop rate is high. Train her at all cost.

a standard RFHG team (Always 3HG and 2RF) from your box I'd recommend is 57, Welrod, PPK, M14 and 1 mroe non-sniping RF. Sniper RFs are very weak nowadays. Not much ppl wanna use them. Except as secretary cos some of them are hawt

M14 - PPK ---- XXX
57 --- Welrod - XXX
YYY -- XXX ---- XXX
YYY put a non-sniping RF. even FN49 can be used if you dont have any viable ones.

a trick for HGRF team is called tank-retreat, click once on your ppk or welrod when the match start, and when u see the enemies stopped running towards you and started aiming, click "retreat" before they actually start firing. different enemies takes different time to stop, aim, and fire. so have to try quite a few times. Takes some practice but it will significantly reduce the damage you take.

No worries bro. There's still lots of fire power or rate rf available early game. Like svd. Wa2000. Lee Enfield. Hf rf team is quite powerful mid game. So must train a team.

I got WA, SVD and Lee very late. Never bothered HG / RF team until not too long ago.

How do you guys farm core ?

Now I feel the pain in obtaining core

Was leveling 2 team together , never have enough core to spend

Due to the mission map , so might need 3 squadron to complete

when this game come out ????

Sorry, what tier do you / they mean?

He mean can heavy build with more cores and tickets. Which is, as he said. Massively unworthy

6/2/6/4?

That's a lot of resources to regain every day.

6/2/6/4 comes to a total of 18k resources daily in total.

Fastest generation of resources (per single type) is around 20k only.

Going 1 heavy production a day means your overall accumulation will be very slow and you might actually regret one day if you don't have enough resources to participate in events.

"Parts" generation is the slowest among all.