I bought a Bear Creek 50 beowulf barrel. I know these are likely crap, but it was the only barrel with the correct profile to fit my gas block. If it sucks, I'll eventually get a custom barrel made. If it works, great! Anyway, I am trying to build a retro dissipator style gun inspired by a video game. I knew that I would likely need to blend the feed ramp. I was not expecting my C7 upper to have M4 feed ramps.

So, because the upper has M4 feed ramps, I'm concerned that if I dremel the upper to match the feed angle of the barrel, that, I will break into the part of the upper with the M4 feed ramp, causing an occasional jam where the bullet hits the part where the M4 feed ramp intersects the bubba'd feed ramp. So, I'm wondering what I should do. Options I'm considering.

1) Do nothing and hope it works.
2) Dremel the feed ramp to match what the barrel currently has (concerned this won't work).
3) Dremel the feed ramp on the barrel extension feed ramp to make it wider, and then dremel the upper to match, which should obliterate the M4 feed ramps. This would match photos I've seen of Tromix feed ramps and other more premium barrels.

Also, what is the ideal dremel attachment for this, and best procedure? I didn't realize just how hard it would be to reach with the barrel installed. Is it better to do the dremeling with the barrel installed, or should I dremel a little at a time with the barrel removed through the front of the upper, and then test fit each time? Then finish it with cratex wheels?

How big should I hog out the ejection port? I am hoping to retain the port cover.  

Finally, what is the preferred magazine follower? I'm hoping to modify some D&H/PSA magazines. The Tromix follower specifically says that D&H mags won't work with their followers.

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BCA is the epitome of overkill with their centerfeed feedramps on their barrels.  They are just padding their stats, so to speak, because the rest of their shit is generally shit.

I wouldn't do anything to the upper until I tried it as is.  The lower and magazines are also at play.

50 beo side charger upper

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Mag followers.

https://www.bigboremag.com

I dremelled out my ejection port to .58. Inwas worried if I did any more, the port door spring would have nothing to push against. Snap caps feed and eject perfect. Should I still hog out to .60, or wait till I have ammo to test?

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When we were building 50 Beo's, we milled the ports the same as the .458 SOCOM.

If you are doing it by hand, start off by raising the port until you feel the door may not stay closed if you raise it any more.
Then lower it until it's .625" (5/8) wide.

Tony

For some reason I've never even looked at the feed ramp or ramps on my Beowulf.  I need to go check.

Awesome, thanks! My only question is, with how much it is already logged out, the ejection port spring already sticks up past the opening. Is this a problem?

Alright, I got this thing basically ready to test. Now all I need it bullets, primers and powder.

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I did take it apart again and dremeled to .625 and the ejection port still works!

I have selected a few STANAG type mags to butcher for this project. My anticipated bullets are either the 300 grain FTX or 350 XTP for hunting, and either the 300 or 350 grain berry's plated bullets for pinker ammo. I currently have two snap caps with round nose bullet profiles, and they feed and eject perfectly without any magazine mods.

Do I really need the big bore specific followers, and should I preemptively cut a semi-circle in the front of the magazine to ease feeding? I'm guessing this will be less important with 300-350 grain bullets than it would be for 500+ grain soda can shaped bullets.

That's a cool build.