I'm trying to design an insert that will slide into a Unibody Phantom to make it useable with modern paint. It will be a cylinder about .750 long and on the breech end it will have a very thin angled lip. I'm thinking a dab of glue will hold it in place. What I need help with is the angle inside of the breech where it goes from the breech diameter down to the barrel diameter. Again this on the inside of the breech and not the outside. Thanks! 
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Just a wag....
It was likely done with a common drill so it's going to be one of those angles. -
I'm not much help for the angle but just popping in to say that ASP can do the detent mod on unibodies as well, which I think is my personal favorite solution to the issue.Comment
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All totally anecdotal, but I've been running the ASP and the stock bored barrel and feel like it's been MORE accurate then when I was bore matching.
Again, completely untested/unconfirmed, but the small loss in efficiency I'm sure I'm getting is outweighed by having less perceived "wingers" or hook shots. I've also been at the mercy of mediocre to terrible field paint 99% of the time so I feel like overboring is more forgiving with the out of shape paint.
I'm always excited to see experimenting one way or the other though. If you get a working setup going I can probably send you an ASP modified body if you want to be able to compare and contrast.
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