There is this bug on Kirin Type-A first batch, the mag could've been over inserted, and stops bolt closing. It is said the later batch would fix this problem by the manufacturer, but here is an easy fix solution:

Just add this 3D printed mag stopper to ensure mag insertion perfectly on the correct location every single time.

Sand it if it fits too tight; change your print parameters or use teflon tape if it is too loose.

DO NOT apply glue, if you still want to use no-shell kit when it gets released.

If you come across trigger lock when pointing the blaster downwards, just add a small screw the position marked in the picture. It is a M2.5*8mm in the picture.