I buy a AGM M4 gas blow back from TMC. After I shoot around three magazine, I find the nozzle broke and the hammer pin separate to two pin."Good quality!!!"

oh~~~only three magazine...... TMC told me the hammer pin, they can free from me, but the nozzle I need to buy a new one. Which one nozzle is better for me---G&P or RA-TECH??? RA-TECH can adjust the power by the key, G&P can not, but RA-TECH is very expensive for me
G&P :http://www.tokyo-model.com.hk/ecshop/goods.php?id=5651
RA-TECH :http://www.tokyo-model.com.hk/ecshop/goods.php?id=4969