Well, researching this the extractor was mentioned as a possible culprit if the pressure is too high. This one does require a bit more force than I would expect to push a cartridge up into the extractor. This gun has an external extractor so replacing the coil spring with a lighter one shouldn't be too big a deal. Also the source said that the extractor entry edges should be rounded slightly when this problem exists. The same article mentioned ejector length in detail and showed the correct shape to fix the problem, but mind, this is not a true 1911.
Tuners response to similar question;
Howdy guys,
The brass isn't ejecting back into your face. It's being knocked backward by the slide because it's ejecting at 3 O'Clock, striking the lower edge of the port...rolling up...and into the path of the top of the port as the slide recoils.
You'll see brass marks on the edges of the port.
This is a fairly common problem with the GI Springfields...about one in three...
and it's not the gun's fault. The ejector is just wrong. Lowering the port won't help much. Replacing the ejector with a Brown extended part...and adjusting the length to allow live-round ejection is most of the cure.
The other part of the fix is to radius the bottom corner of the extractor hook
a little, and lightly breaking the corner on the backside to the hook so that the case will twist free without the front of the extractor getting into a bind
in the case's extractor groove.
There's also a possibility of the extractor hook being a little too deep from the tip to the bottom of the slot where the case rim contacts. Use calipers to measure from the tip to the backside...and then from the tip to the bottom of the slot, and subtract the difference. The difference should be
.032 to .035 inch. If it's too long, drag the tip sideways across a medium stone, being careful to keep it level...until it's in spec. Swipe the bottom corner in a sort of "rocking" motion to radius it, and LIGHTY break the top corner. Use a smooth mill file to cut a light bevel on the backside of the
end of the extractor...on the side opposite the hook to give it a little rollout clearance.
The ejector should be filed straight across to shorten it until it will eject a live ball round without hanging up in the port. Careful...if it wiggles around
just right, the primer can detonate on the end of the ejector. Test-fire the gun to see where the brass ejects. If it kicks out too high, file an angle on the bottom corner of the ejector to raise the point of impact with the brass.
Easy...A little goes a long way. Take a few strokes and test-fire. Repeat
until the ejection pattern changes. If it kicks out at a forward angle, lightly file an angle on the right side to cause the case twist free toward the rear.
Angle the top right corner a little to fine-tune the pattern until it ejects at 2 O'Clock or thereabouts. You can bias it toward the front or the rear with the side angle on the front of the ejector. Personally, I lean toward having the brass exit at 15 degrees right rear, and land 3-5 feet from the gun...but the distance is of no consequence as long as it gets clear of the port and doesn't
hit me in the face.
Luck!
Tuner
and that website;
http://www.brazoscustom.com/magart/ejection perfection.htm