you have got one big mouth on you sir, ive had the trubor and the grandmaster and yes i did need some work on them to run but i can say 100% this gun has worked from the box,loads of oil and broke it in with around 600 rounds,now in that 600 i did have a ftf a few times but didn't do any thing about it,just run the gun in and then if your having a problem then see to it, so meny play with the gun too early. run it in first