50BMG update thread

[Zero99z]

Alright, so I got my tax stamp, and I'm trying to figure out how to plug weld the freeze plug baffles. Yes, I know, not great for 50 cal, but they work for my design https://imgur.com/a/x2SSH1x . The tube is 2" od, 1.80 id. I'm thinking 4 counter sunk 1/4" holes should work. Opinions?

[T-Rex]

No reason to go so large, with plug hole. Do 6 or 8 1/8" plugs. Larger holes = more heat.

1.81 OD is EXTREMELY small for 50BMG.

[Zero99z]

No reason to go so large, with plug hole. Do 6 or 8 1/8" plugs. Larger holes = more heat.

1.81 OD is EXTREMELY small for 50BMG.

It has a 1.80 ID and 2"OD, but that's just the tube that holds the baffles. It recesses into a 3" OD tube. Both tubes are 12" long. It's a coaxial hybrid design. Another thought was to just fill it and cap it, no plug welds needed, bit I'd like to have some spacing.

[T-Rex]

Yes, sorry. ID was intended, instead of OD.

Still, pretty small. What's the overlap, of the 2 tubes?

You don't typically fill a 50BMG suppressor w/ baffles. Plug welding will eliminate need for spacers, saving weight.

[Zero99z]

Yes, sorry. ID was intended, instead of OD.

Still, pretty small. What's the overlap, of the 2 tubes?

You don't typically fill a 50BMG suppressor w/ baffles. Plug welding will eliminate need for spacers, saving weight.

It'll probably be 4-6". This is how I'm thinking of doing the baffles https://imgur.com/a/sLO6bjC. There's a total of 10 baffles.

[Zero99z]

Just finished up on the inconel blast diffuser. I thought I'd go a little unconventional. I know brakes can erode the sides of the can, and I thought this might help reduce that. Let me know what you guys think!

Diffuser https://imgur.com/a/z0GhOaw

[T-Rex]

IMHO, you've just negated the brake porting. The brake would have diffused the blast much better than those slits. What you've done is refocused the blast stream. If you were worried about gas eroding the tube interior, this would be more detrimental than the open brake. Get rid of that shield entirely.

What's you're main tube wall thickness, around this area and what material?

[Zero99z]

IMHO, you've just negated the brake porting. The brake would have diffused the blast much better than those slits. What you've done is refocused the blast stream. If you were worried about gas eroding the tube interior, this would be more detrimental than the open brake. Get rid of that shield entirely.

What's you're main tube wall thickness, around this area and what material?

That is good to know. I'll just cut it off then. It's 3" od x 2.76" id x .12" wall 4130 chromoly. I've heard people say chromoly isn't the best choice, but it is what Barrett used for their qdl.

[T-Rex]

Your design doesn't require a blast spacer, correct?
Regardless, I highly doubt you'll fire enough rounds through this suppressor to do detrimental damage to 1/8" thk steel. Especially since it's not seeing a direct blast front.

[Zero99z]

Your design doesn't require a blast spacer, correct?
Regardless, I highly doubt you'll fire enough rounds through this suppressor to do detrimental damage to 1/8" thk steel. Especially since it's not seeing a direct blast front.

Blast spacer? I'm still going to have a blast baffle.

[Zero99z]

Finally got my can tacked up and should have it finished by the weekend, if not tomorrow. The angle isn't great, but it's just under 20".

Form 1 https://imgur.com/a/OvepE1F

I know it's a goofy design and may not work great, but that's ok.
My theory is that by having the baffle stack in a smaller tube, and recessing it in the larger one, it'll force the gas to dwell longer. As long as it tames the recoil, I don't really care how quiet it is.

[Zero99z]

I finally got my form 1 done yesterday!

Form 1 done https://imgur.com/a/BcEbpVt

[Zero99z]

I had to overbore my can cuz of a baffle strike the other day, but I am pleasantly surprised to say it had no effect on sound reduction. With subsonic loads, I couldn't even hear it over the other shots at the indoor range, and with regular loads it was still the quietest thing on the range! I pretty much failed at reducing recoil, but totally won at sound reduction.