BoltAmphibian, was it the bolt or the carrier that had the hairline fractures?
I just watched his video.Have any of you seen this video
Ejection issue fixed
Basically he believes that the bolt cycling slowly is partly to blame for the ejection issues. Also something about the ejector causing the ejector spring to become bound. And possibly the 16" barrels have more problems than the shorter options.
So Amphibian, i know you are trying to get yours to run slower in full auto.
I wonder if there is a way to increase speed of the bolt, decreasing carrier mass, multistage/progressive spring allowing a fast extraction/ejection event before slowing down the bolt, etc?
I tried even using a custom ejector made from a drill rod and limited the travel and it was worse. I think maybe due to the increase mass of the custom ejector.I wonder if the ejector could be made to not go back any farther than flush with the bolt face. If it doesn't experience that bounce, perhaps the ejector spring wouldn't get squashed
That is what I did but the spring still got deformed.I kmow at one point Amphibian used a nail to try to keep the spring aligned. Why not measure the depth of the ejector hole, insert a stainless nail just long enough so that the ejector can't go any deeper into the bolt than flush. If that makes sense.
Too soon to say since it is just out but I don't think the bolts will break since they moved the cam pin hole further back so the ejector slot isn't near it.How do you suppose the dissents fixed ejector is "problem free" they obviously milled out a slot in the bolt and carrier.
The Olympic Arms (OA) AR pattern PCC uppers have/had a spring type ejector mounted in the upper. The ejector rides against the bolt carrier until the BCG is rearward and then the ejector flips inward to engage the rear of the casing and cause the casing to be kicked out the ejection port. In the OA ejection system, the "weak link" is the spring region of the ejector. As has been noted, in the CMMG system, the ejector spring can be that system's "weak link".How about a spring loaded fixed ejector. The ejector could pop out into the space between the carrier and the bolt lugs as the bolt travels rearword. This way, only the slot and some lead-in into the bolt face would need to be machined.
The spring loaded ejector would just ride along the bolt carrier. If its designed similar to the radian raptor charging handle (no force on the pin) it could be pretty robust.
Remember that the bolt still needs to have some rotation unlike a straight blowback or even a delayed blowback like the MDP9 which uses a spring loaded ejector. The issue is that even if it was spring loaded the ejector still needs to be placed after the cam pin hole so you still need to slot the bolt in that area which weakens the bolt.How about a spring loaded fixed ejector. The ejector could pop out into the space between the carrier and the bolt lugs as the bolt travels rearword. This way, only the slot and some lead-in into the bolt face would need to be machined.
The spring loaded ejector would just ride along the bolt carrier. If its designed similar to the radian raptor charging handle (no force on the pin) it could be pretty robust.