Your airsoft gun could also be feeding incorrectly if you tappet plate is broken or worn down. Replace this part once you notice your airsoft gun feeding poorly. The Echo1 Red Star CSR Tappet Plate with Spring is an o.e.m replacement part for your Echo1 CSR airsoft gun. it’s designed to figure with the Echo 1 Red Star CSR. it’s going to fit with other airsoft guns but this can’t be guaranteed by Airsoft Gun.