300 BlkOut issue solved

[12th Man]

I just heard back from Defense Grid the upper manufacture. They received my 300 BlkOut upper this morning and got right to work on it. A few things going on. I left the muzzle brake/suppressor adaptor on when I shipped it to them. The bullet was definitely striking the brake. Looking more carefully at the baffles I can see some shinny marks that I missed on my first inspection. It helped when I turned the baffle around and looked from the other side. Hence why it shot poorly with and without the suppressor. There was also a crush washer on between the brake and barrel to get the ports of the brake were positioned correctly. The suppressor manufacture said they needed to be ported to the sides and use a crush washer if necessary. That could have had something to do with this as well. They're also going to look at the threads on the end at the barrel to make sure they're concentric with the bore. He said sometimes things happens.

Just some dude was onto something when he said did I remove the brake. I did not. Anyhow, there going to disassemble the complete upper and check it out and shoot it. They'll replace the barrel if necessary. They said it would ship back 100% ready to go. It will probably ship today or tomorrow. I loved the customer service.

Just got an update from them just after I posted this. The culprit was the crush washer, it put the brake out of alignment. Everything checked out 100% and has already been packaged and waiting for UPS to pick up today. Again great customer service.

This was my old suppressor I was using until my new Thunder Beast arrived. A week shy of eight months and was notified last week to come get it. Thunder Beast has a universal adapter as they call it that goes on the barrel threads. No crush washer needed to line up anything.

Glad they're figuring it out. I certainly missed some things on my inspection.

Let my beatings begin!

[Wambli Ska]

No beating. Just glad you found the issue and had great customer service from those guys. Good to know and thanks for the update.

[CPJ 2.0]

That explanation of the problem makes absolutely zero sense in my head. The brake is concentric with the threads or it is not. The crush washer cant throw it out of alignment. Unless the threads are extremely sloppy and even then I have a hard time visualizing that.

[12th Man]

Just letting you know what they told me. I'll shoot it later next week when I receive it and the weather warms up.

[Diver43]

That explanation of the problem makes absolutely zero sense in my head. The brake is concentric with the threads or it is not. The crush washer cant throw it out of alignment. Unless the threads are extremely sloppy and even then I have a hard time visualizing that.

After spending way too much time attention to time my brake using shims, I had the same thought. The device is lined up my the threads way in front of a crush washer or anything else.

Glad they are fixing it

[Wambli Ska]

That explanation of the problem makes absolutely zero sense in my head. The brake is concentric with the threads or it is not. The crush washer cant throw it out of alignment. Unless the threads are extremely sloppy and even then I have a hard time visualizing that.

After spending way too much time attention to time my brake using shims, I had the same thought. The device is lined up my the threads way in front of a crush washer or anything else.

Glad they are fixing it

When threads are cut there can be small variations in the depth that under normal circumstances/applications may not make a difference but in some circumstances just a few .001s of an inch could be enough to cause trouble. Usually the issue is on the female end (shocking no?) That happens with shotgun choke threads where at times one brand of choke might not work in a particular shotgun if the threads in the barrel were cut even just slightly shallow.

[Justsomedude]

Was it shimmed or crush washer?

[12th Man]

crush washer

[Justsomedude]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

[CPJ 2.0]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

I’ll be the pompous ass…. (Because of course I will)
Shims are a scabby way of timing a brake. Face off the ass end of the brake to line it up.

[CPJ 2.0]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

Concentricity may not be the best term. Let’s be semantic!
You could have a brake that’s perfectly concentric. If the threads were dog squeeze and sloppy, and the crush washer tilted the brake, I could see the end of the brake being in line with the bore of the barrel and getting smacked.

I’m also gonna wager that’s not possible with a proper thread fit.

[Justsomedude]

Even with perfectly straight threads, a crush washer will not crush evenly flat and the shoulder is what keeps everything concentric and flat. Peel washers are ugly and that's why I do as you said and face off the muzzle device until it indexes.

[CPJ 2.0]

Even with perfectly straight threads, a crush washer will not crush evenly flat and the shoulder is what keeps everything concentric and flat. Peel washers are ugly and that's why I do as you said and face off the muzzle device until it indexes.

Can confirm….tilt is a thing. I’ll make a video after dinner. Quite interesting the results I just got.

I can see the washer being as an issue on a can. On a brake? Man it would have to be a long one or really poop threads.

[Justsomedude]

I'll use a crush washer on a simple brake but a QC adapter for a can gets machined flush until it indexes. I actually just did 2 pin and welds and did just that.

[GrapeApe]

Glad they got it figured out.
Thanks for the update

[12th Man]

I had no idea a crush washer could create this type of issue. I simply used what I was told to use. Anyhow, problem is solved.

[Zee]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

This.
And why I don’t use crush washers. Either machine it or shim it.

[Zee]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

I’ll be the pompous ass…. (Because of course I will)
Shims are a scabby way of timing a brake. Face off the ass end of the brake to line it up.

Some of us don’t have a machine in our garage.

[Zee]

Even with perfectly straight threads, a crush washer will not crush evenly flat and the shoulder is what keeps everything concentric and flat. Peel washers are ugly and that's why I do as you said and face off the muzzle device until it indexes.

This.
Crush Washers are ape poop.

[Zee]

I had no idea a crush washer could create this type of issue. I simply used what I was told to use. Anyhow, problem is solved.

Shims or machine in the future. Crush washers are taking the fat lady home at last call.

[CPJ 2.0]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

I’ll be the pompous ass…. (Because of course I will)
Shims are a scabby way of timing a brake. Face off the ass end of the brake to line it up.

Some of us don’t have a machine in our garage.

if you have something flat and some sandpaper, youre golden. No machine needed

[Diver43]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

I’ll be the pompous ass…. (Because of course I will)
Shims are a scabby way of timing a brake. Face off the ass end of the brake to line it up.

Brother CPJ, not everyone is a machinest.
The shims were a PITA to get the right combination, but worth the effort.

[Zee]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

I’ll be the pompous ass…. (Because of course I will)
Shims are a scabby way of timing a brake. Face off the ass end of the brake to line it up.

Brother CPJ, not everyone is a machinest.
The shims were a PITA to get the right combination, but worth the effort.

You didn’t ask “how”.

[Zee]

I’ll be the pompous ass…. (Because of course I will)
Shims are a scabby way of timing a brake. Face off the ass end of the brake to line it up.

Some of us don’t have a machine in our garage.

if you have something flat and some sandpaper, youre golden. No machine needed

IMG_6074.gif (2.56 MiB) Viewed 2321 times

[CPJ 2.0]

Crush washer won't keep a muzzle device perpendicular to the shoulder because it wont crush down evenly. Shims are meant to be used in a place where perfect concentricity is needed, ie suppressor use.

I’ll be the pompous ass…. (Because of course I will)
Shims are a scabby way of timing a brake. Face off the ass end of the brake to line it up.

Brother CPJ, not everyone is a machinest.
The shims were a PITA to get the right combination, but worth the effort.

The comment was directed at gunsmiths.

Buuuuttttt, flat plate, sandpaper. Mark up the back of the brake with a sharpie. Sand the ass end, ensuring you’re removing equal material. Trial fit.
Rinse and repeat. It’s surprisingly easy, provided you don’t sand so much that you roll past 12:00. Then you get to sand off enough to make another turn.