Feeding problem

[A5BLASTER]

1) firing last round keeps bolt open/back
2) mag drops free no problem after last round fired

just wanted to point out again that the mag is E-Lander, the one which is considered top brand and im not feeling comfortable messing with its lips etc


but main thing i want to ask is.... is the problem i described because bolt going back and forth too fast, or too slow? should i start increasing or decreasing gas in gas block in next experiments?

No do not adjust the gas. If it's locking back on last round and the mag drops free and the brass is landing in the 3 to 4 o'clock zone the gas is good.

You have a mag issue change mags are fix the problem mag.