GBBR recommendations please! Trying to get into Airsoft.

Yo! Been really interested in the hobby for quite some time and have gotten a few GBB’s but never been out in the field. Now that I’ve moved to a new location and there seems to be a field not to far from me, I would like to get some GBB’s and upgrade recommendations that works with there rules.

That being All HPA/GBB guns must chrono at 317Fps (less then 1.5 joules) using field provided .32g BB’s. (This is equivalent to 400Fps with .20BB’s).

Currently the GBB’s I own are the Umarex MP7 and the sidearm being Elite Force 18C. Been interested in getting a TM, specifically a AKX/M, M4A1 MWS, or the Saiga SBS/12. Haven’t done any research on a new sidearm yet.

Anyways! Any recommendations and advice would be appreciated!