Posted by: Vampyr on December 30, 2002 at 21:42:06

: yeh the backblock I do, was just wondeering about that tp thing : so basically if the timing is very close together it will create hte blowback cause the bolt is opening very close to the valve opening? so its better to put a slight gap after firing to prevent this (testing with the tp of course) Prertty much. You get suction just slightly after blowback. This is true venturi effect from gasflow past the feedtube. If you delay the bolt opening slightly more, you get no blowback or suction (conservatively timed). I basically time similar to you, I start by getting reliable catch of the lug by the sear. By doing this, it moves the firing point as far forward as it can be, then work from there.

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