Reply #13: Try that with a gun bigger than a .22 and it will likely blow up in your..

[Silverhair]

...face. You merely filed down the sear, which allows the hammer to follow the bolt as it moves forward. That causes the hammer to strike the firing pin a bit earlier than it would in a gun designed as a full auto. In a real full auto, the hammer is delayed a bit before it is released so that the cartridge can be fully chambered. .22s are so low powered that the only thing that happened to you was the gun jamming by premature firing. But with a more powerful cartridge, premature ignition can cause the case head to rupture allowing the burning gases to escape around the face of the not completely seated bolt. Translation: It blows up in your face.

There are also other problems with your method, (Jaming & misfires) but that is the worst one.