300 blackout build complete
300 blackout build complete
my first form 1 is complete, also my first NFA item.
30 caliber 11" x 1.625"
.065" wall grade 9 titanaium tube. 28 TPI threads on endcaps.
316 stainless steel endcaps
17-4 stainless steel blast spacer and baffle
grade 5 titanium k baffles
welded to a 10.5" 300 blackout barrel for a 1 stamp SBR. endcap is pinned to the tube and welded.
rifle length yankee hill diamond quad rail handguard, 1.75" ID
i dont know what it weighs because its welded to a barrel and assembled into a rifle, however im guessing it weighs about 32 oz (Edit: 26 oz). this upper weighs almost exactly as much as my 20" .223 heavy barrel upper and the .223 upper has a lighter handguard. I know i couldve made it lighter, but this is mostly a range toy and maybe a hunting rifle for still hunting coyotes at night, I dont mind the weight, the gun actually has very nice balance and aims steady.
all that is left to do is test fire and have it cerakoted.
30 caliber 11" x 1.625"
.065" wall grade 9 titanaium tube. 28 TPI threads on endcaps.
316 stainless steel endcaps
17-4 stainless steel blast spacer and baffle
grade 5 titanium k baffles
welded to a 10.5" 300 blackout barrel for a 1 stamp SBR. endcap is pinned to the tube and welded.
rifle length yankee hill diamond quad rail handguard, 1.75" ID
i dont know what it weighs because its welded to a barrel and assembled into a rifle, however im guessing it weighs about 32 oz (Edit: 26 oz). this upper weighs almost exactly as much as my 20" .223 heavy barrel upper and the .223 upper has a lighter handguard. I know i couldve made it lighter, but this is mostly a range toy and maybe a hunting rifle for still hunting coyotes at night, I dont mind the weight, the gun actually has very nice balance and aims steady.
all that is left to do is test fire and have it cerakoted.
Last edited by fishman on Thu Jul 26, 2018 12:33 pm, edited 4 times in total.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Re: 300 blackout build complete
all turning and threading was done on a very small Sherline lathe.
dont let anyone tell you you cant cut g5 titanium dry or with High Speed Steel. you can. tap magic cutting fluid helped tool life though.
threads were cut with a solid carbide tool. 1 thou per pass. 3 in 1 oil used as lube.
milling the 45 degree cuts on my school's bridgeport. this fixture had terrible rigidity.
solidoworks flow analysis
dont let anyone tell you you cant cut g5 titanium dry or with High Speed Steel. you can. tap magic cutting fluid helped tool life though.
threads were cut with a solid carbide tool. 1 thou per pass. 3 in 1 oil used as lube.
milling the 45 degree cuts on my school's bridgeport. this fixture had terrible rigidity.
solidoworks flow analysis
Last edited by fishman on Wed Aug 23, 2017 12:52 pm, edited 1 time in total.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
- whiterussian1974
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Re: 300 blackout build complete
Perfectly illustrated design, process, and finished Product.
Bravo Brother!
Would you try flow analysis with each K flipped 180* so that they alternate orientations? That's what Curtis Tactical and Capt Link suggest for best performance.
Bravo Brother!
Would you try flow analysis with each K flipped 180* so that they alternate orientations? That's what Curtis Tactical and Capt Link suggest for best performance.
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Re: 300 blackout build complete
thank youwhiterussian1974 wrote: Perfectly illustrated design, process, and finished Product.
Bravo Brother!
Would you try flow analysis with each K flipped 180* so that they alternate orientations? That's what Curtis Tactical and Capt Link suggest for best performance.
i did that, the flow was much less turbulent. solidworks FlowXpress is only capable of continuous flow analysis, so it doesnt model a silencer too well, but from what ive seen, i'd guess orienting them all the same would work better. i'll have to try it and see.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Re: 300 blackout build complete
i just ran it again in the alternate configurationwhiterussian1974 wrote:Would you try flow analysis with each K flipped 180* so that they alternate orientations? That's what Curtis Tactical and Capt Link suggest for best performance.
i think they both look good
EDIT:
"I honestly have found k baffle orientation to have little effect on suppression" - curtistactical
Last edited by fishman on Wed Aug 23, 2017 12:55 pm, edited 1 time in total.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
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Re: 300 blackout build complete
Nice job fish.
Too bad the endcap isn't Ti or you could have done some anodizing or flame coloring
Waiting for field test....
Too bad the endcap isn't Ti or you could have done some anodizing or flame coloring
Waiting for field test....
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Re: 300 blackout build complete
Nice looking build!
If you have it modeled in solid works, it should give you a pretty good estimate of the weight without the barrel.
If you have it modeled in solid works, it should give you a pretty good estimate of the weight without the barrel.
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387
Re: 300 blackout build complete
good idea, i forgot about that. solidworks says 26 oz.daPhoosa wrote:Nice looking build!
If you have it modeled in solid works, it should give you a pretty good estimate of the weight without the barrel.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Re: 300 blackout build complete
Thanks for posting up your project. It looks sweet.
I know pretty much nothing of working in metals, so I find this stuff equal parts fascinating and voodoo craft. Still, it is cool to see how people design and build their own can. I might have to try it some time in my neighbor's shop.
I know pretty much nothing of working in metals, so I find this stuff equal parts fascinating and voodoo craft. Still, it is cool to see how people design and build their own can. I might have to try it some time in my neighbor's shop.
Re: 300 blackout build complete
I just got back from the range. I'm very pleased with the performance. I haven't shot many suppressed guns so I don't have a great comparison of how quiet it is. I had the gas block closed so that I could hear how well the silencer worked without action noise. It's very comfortable to shoot without hearing protection. Absolutely no ear ringing even after 25 shots. It was much much quieter than the 16" 300 blackout I shot previously with a silencerco osprey 45. Much quieter than an unsupressed .22LR. Pulling the bolt back and loading a round was louder than the shot. From 50 yards away, it sounds about as loud as if the shooter sneezed. I wish I had a meter so I could give you guys numbers on it. FRP was unnoticeable. I'm very very pleased with the results, it exceeded my expectations.
Edit: heres my 50 yard group off sandbags with American eagle 220 grain and sig Sauer 220 grain ammo.
Edit: heres my 50 yard group off sandbags with American eagle 220 grain and sig Sauer 220 grain ammo.
Last edited by fishman on Wed Aug 23, 2017 1:12 pm, edited 1 time in total.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Re: 300 blackout build complete
Nice build! That's about the group I get with my 11" seven cone can. I'm good with no ear protection using supersonic ammo on my 300 Blackout. Machining Ks is a bunch of work over a cone, a tip of the hat to you.
When you come to a fork in the road, take it.
Re: 300 blackout build complete
Got it back from getting cerakoted today, finally done.
Last edited by fishman on Wed Aug 23, 2017 1:11 pm, edited 1 time in total.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
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Re: 300 blackout build complete
The machine work looks excellent, very nice finish as well. Where did you send it for cerakote if you don't mind my asking?
www.julietdeltacustoms.com
Juliet Delta Customs- Custom machined solvent traps, cups, direct thread mounts, and much more.
[email protected] or [email protected]
Juliet Delta Customs- Custom machined solvent traps, cups, direct thread mounts, and much more.
[email protected] or [email protected]
Re: 300 blackout build complete
Fantastic workmanship.
I am curious to any effect that the baffle alignment might have on accuracy. I wonder, if the cutouts were aligned with bullet rotation based on rifling (1 in 12 as an example), would that induce some wobble. Alternately if they were random or opposite of the the rifling. You might play around with it and see if you can hit a real sweet spot.
I am curious to any effect that the baffle alignment might have on accuracy. I wonder, if the cutouts were aligned with bullet rotation based on rifling (1 in 12 as an example), would that induce some wobble. Alternately if they were random or opposite of the the rifling. You might play around with it and see if you can hit a real sweet spot.
July 5th, 2016. The day that we moved from a soft tyranny to a hard tyranny.
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Re: 300 blackout build complete
Than you have succeeded!!fishman wrote: it exceeded my expectations.
Any post shooting pics, of the baffles, to show carbon deposits/flow patterns?
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Re: 300 blackout build complete
Nice work, especially given that it was done on a Sherline.
Andy Gamble
Binary Arms
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Re: 300 blackout build complete
CurtistacticalGhost-Delta wrote:The machine work looks excellent, very nice finish as well. Where did you send it for cerakote if you don't mind my asking?
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Re: 300 blackout build complete
The sherline does great work, it's a quality machine. It just does great work very slowly. Cutting titanium and 17-4 of that diameter was about as much as this lathe could handle, it would stall if I tried to take a cut much bigger than .020" at a good feed rate for titanium.BinaryAndy wrote:Nice work, especially given that it was done on a Sherline.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Re: 300 blackout build complete
Honestly, 300 blackout isn't even really intended for shots past 100 yards, I'm fine with that group size. Maybe my handloads will perform better. I didn't expect much from American eagle ammo.bakerjw wrote:Fantastic workmanship.
I am curious to any effect that the baffle alignment might have on accuracy. I wonder, if the cutouts were aligned with bullet rotation based on rifling (1 in 12 as an example), would that induce some wobble. Alternately if they were random or opposite of the the rifling. You might play around with it and see if you can hit a real sweet spot.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
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Re: 300 blackout build complete
You have the patience of a saint cutting those alloys on a Sherline.
Any particular reason you cut the rear port old school style.
It looks to be a very solid build congratulations.
-CL
Any particular reason you cut the rear port old school style.
It looks to be a very solid build congratulations.
-CL
The only reason after 243 years the government now wants to disarm you is they intend to do something you would shoot them for!
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=79895
Re: 300 blackout build complete
I liked the way that when I cut the port that way, it created a lot of asymmetry in the waist of the k baffle. I think this way does a better job of letting the cross-bore jet of gasses from the scoop cut direct the main flow away from the bore axis. I obsessed over the k design for months before I was happy with it. I took a lot of inspiration from the aac tirant k baffle design, and joe jones' (curtis tactical) k design. Joe cuts his baffles this way too.Capt. Link. wrote:Any particular reason you cut the rear port old school style.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
Re: 300 blackout build complete
They don't tell much of a story. The blackest part is the inside of the skirt on the opposite side of the waist vent. They're pretty evenly covered besides that.T-Rex wrote:Than you have succeeded!!fishman wrote: it exceeded my expectations.
Any post shooting pics, of the baffles, to show carbon deposits/flow patterns?
Inside skirts
Front faces
Last edited by fishman on Wed Aug 23, 2017 1:06 pm, edited 1 time in total.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
- T-Rex
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Re: 300 blackout build complete
Placing in order and noting the difference in carbon deposits will tell a tale. So will looking at the deposits on the outer skirt, for flow pattern/path.
Might offer something you could use on another build or for comparison on the effects of different K features.
Might offer something you could use on another build or for comparison on the effects of different K features.
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Re: 300 blackout build complete
I'd have to clean them real well then shoot only a couple shots through it. It was just too dirty to tell much of anything. The lithium grease didn't help I'm sure.T-Rex wrote:Placing in order and noting the difference in carbon deposits will tell a tale. So will looking at the deposits on the outer skirt, for flow pattern/path.
Might offer something you could use on another build or for comparison on the effects of different K features.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
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Re: 300 blackout build complete
Actually shooting a few dozen rounds through it would be more likely to tell the true tale. Patterns emerge after a while. Especially useful in analysis of flow into the expansion volume outside the K baffles. If after 30 or 40 shots there's still very little evidence of firing outside the skirts, you could surmise that the porting wasn't quite doing its job. From the tiny bit of that area I can make out in your pictures it seems there are some dark spots appearing, so that's good. At a guess it seems that the angled drill approach has taken the waist port out of the equation a little however, as the exit hole is quite far from the bore line. That's why dipping in from the front of the baffle with a round-nosed or flat-nosed mill bit is generally preferred, keeping this port very close to the area of highest pressure and thus forcing more gas expansion into the outer volume. But hey, if the suppressor is effective, if you're happy with it, then it worked.fishman wrote:I'd have to clean them real well then shoot only a couple shots through it. It was just too dirty to tell much of anything. The lithium grease didn't help I'm sure.