Re: Mg2
Posted: Sun Apr 10, 2022 9:09 am
The extractor tip geometry that seems to be required to work well is unlike any pistol extractor setup I've ever seen before. If my theory is right, it works by supporting the case at three locations instead of the usual two (extractor tip & rim pocket on slide face).
It's a bit difficult to explain well without drawings and pictures. The case is still in contact with the slide pocket on the left, but the extractor hits the case wall at the forward edge of the blunt tip in the photos.
That tips the case to the left, and the extractor slides down the case wall until the rim of the case hits the back of the extractor tip.
The case is now held at three locations, but I think the key thing is that the contact at the back of the tip is a line and not just a point. The edge of the extractor is in contact with the front of the rim, which is (vaguely) flat. When the case is held this way, you can actually feel resistance to the mouth of the case tipping downward.
If your extractor is marginal in an MG2, you will typically experience jams after the 5th round. I think this is because there's nothing in the carrier to prevent the case mouth from sagging downward. That bounces off the slide rail, knocking the case loose prematurely.
The piece I haven't figured out is why nobody else's pistols require this 3-point support. It may have to do with the really fast cycling with the light slide. If the pistol pops up really fast in recoil, inertia will tend to hold the case mouth down.
In any event, those are my current theories... The extractor in the above photos shoots Aguila just fine now, and in several hundred rounds, hasn't bounced a case off the slide rail once.
It's a bit difficult to explain well without drawings and pictures. The case is still in contact with the slide pocket on the left, but the extractor hits the case wall at the forward edge of the blunt tip in the photos.
That tips the case to the left, and the extractor slides down the case wall until the rim of the case hits the back of the extractor tip.
The case is now held at three locations, but I think the key thing is that the contact at the back of the tip is a line and not just a point. The edge of the extractor is in contact with the front of the rim, which is (vaguely) flat. When the case is held this way, you can actually feel resistance to the mouth of the case tipping downward.
If your extractor is marginal in an MG2, you will typically experience jams after the 5th round. I think this is because there's nothing in the carrier to prevent the case mouth from sagging downward. That bounces off the slide rail, knocking the case loose prematurely.
The piece I haven't figured out is why nobody else's pistols require this 3-point support. It may have to do with the really fast cycling with the light slide. If the pistol pops up really fast in recoil, inertia will tend to hold the case mouth down.
In any event, those are my current theories... The extractor in the above photos shoots Aguila just fine now, and in several hundred rounds, hasn't bounced a case off the slide rail once.