Good afternoon guys...
I've never had a question before, but I do now... and so I'm hoping that someone with experience & hands on, who's done this before can answer it for me.
I bought a kit, my 1st DIY, from SDTac almost two & a half years ago, but never started on plans for it until a few months ago due to medical/finance issues. It's a 7.6" Carbon Steel tube, stainless steel spacer tube, thread protector, end cap & centering tool. And I bought the same freeze plugs from NAPA that SDT sold. I'm shooting 5.56mm (.223) & the can will be going on a 10.5" barrel.
I've got understanding of the blast chamber & baffles down, but I've not been able to find a direct answer to the question rattling around in my head; as to whether or not the 'end cap' hole should be at the same size as the baffle holes, or can they be different? It's kind of assumed that they would be the same size, within most of the posts I've read here and videos I've watched over the years. I've never found an exact answer though... and I don't want to assume. Back in 2015 before & after buying the kit, I watched ALL of SD's vids, many others, and have done a lot of reading... Per one of SD's older vids, it says to go 1/4" on the baffles for .223/5.56 with no direct mention of the end cap; that I remember... And as yu all know, those vids are pretty much all gone now... Then most recently, I came across a great chart posted here by someone of vast knowledge, that has all of the baffle tolerances for every caliber (Thank yu!) and he wrote 9/32 for .223/5.56 ... which makes sense to me on the baffles, allowing extra tolerances, 'to include aiding of gas pressure dispersion' along with the other important baffle issues. I'm no expert here though, and now that Form 1 is in works ... 9/32 is where I plan to drill my baffles. But the end cap that I got from SD, I planned to keep at 1/4" because that size is at SD's suggested sizing in the original vid that I mentioned and it always said, go with a 1/4" drill bit for .223/5.56 - Would it be wrong to think this is because the end cap isn't performing as a baffle?
Anyway, now that those vids are gone, I was hoping I could get another opinion/answer on my question, from those who've done this before... Should the end cap be 9/32 just as the baffles would be, or is it okay to keep with 1/4" on the end cap?
Thank you guys for your time, really... It is appreciated
~Grey Wolf
What would yu do here? Question for those with hands on experience...
What would yu do here? Question for those with hands on experience...
Last edited by Grey_Wolf on Wed Jul 19, 2017 7:05 pm, edited 3 times in total.
Re: What would yu do here? Question for those with hands on experience...
You would want to get larger as the bore got further from the muzzle due to machining inaccuracies, not smaller. One company and some guys here even taper their bores with the smallest being the blast baffle and the largest being the end cap. 0.25 is pretty damn tight 7" from the muzzle IMO.Grey_Wolf wrote:Good afternoon guys...
Snip
Thank you guys for your time, really... It is appreciated
~Grey Wolf
Last edited by propeine on Wed Jul 19, 2017 8:17 pm, edited 1 time in total.
-
- Senior Silent Operator
- Posts: 125
- Joined: Fri Jun 06, 2008 9:08 pm
Re: What would yu do here? Question for those with hands on experience...
.25 -.223 = .027
.027 / 2 = .0135
that means with perfect tolerances the bullet will have .0135 inches between it and the endcap
For reference a typical human hair or a sheet of paper is .004 thick
I usually go around .06 over bore diameter
.223 + .06 = .283
9 / 32 = .28125
.027 / 2 = .0135
that means with perfect tolerances the bullet will have .0135 inches between it and the endcap
For reference a typical human hair or a sheet of paper is .004 thick
I usually go around .06 over bore diameter
.223 + .06 = .283
9 / 32 = .28125
Re: What would yu do here? Question for those with hands on experience...
I have done this with great results. Lately I have been "over-boring" the first 3 baffles (starting with the blast baffle ). Not sure it's any quieter, but it has a more mellow tone. Certainly not any louder. More work on that though before i am sold on it..25 -.223 = .027
.027 / 2 = .0135
that means with perfect tolerances the bullet will have .0135 inches between it and the endcap
For reference a typical human hair or a sheet of paper is .004 thick
I usually go around .06 over bore diameter
.223 + .06 = .283
9 / 32 = .28125
That being said, I would follow Crazyelese's very sound advice.
Last edited by Sergeant on Thu Jul 20, 2017 7:11 am, edited 2 times in total.
- T-Rex
- Silent But Deadly
- Posts: 1865
- Joined: Wed Oct 29, 2014 3:38 pm
- Location: CT - The AntiConstitution State
Re: What would yu do here? Question for those with hands on experience...
I concur.
.265" (17/64) is my "go-to" size for anything .22cal related.
As stated, it comes down to tolerances and being able to hold them, once several inches from muzzle.
The end cap is a baffle. It's restricting flow and preventing a sudden release of gas, is it not?
.265" (17/64) is my "go-to" size for anything .22cal related.
As stated, it comes down to tolerances and being able to hold them, once several inches from muzzle.
Why do you think this?Grey_Wolf wrote:Would it be wrong to think this is because the end cap isn't performing as a baffle?
The end cap is a baffle. It's restricting flow and preventing a sudden release of gas, is it not?
Completed Builds www.silencertalk.com/forum/viewtopic.php?t=79895
Burst Calculator www.engineersedge.com/calculators/pipe_bust_calc.htm
Silencer Porn www.instagram.com/explore/tags/silencerporn/
Burst Calculator www.engineersedge.com/calculators/pipe_bust_calc.htm
Silencer Porn www.instagram.com/explore/tags/silencerporn/
Re: What would yu do here? Question for those with hands on experience...
for what its worth my freeze plug silencer is 11 inches long with 11 baffles and is .265 all the way. 9 years and way over 10 thousand rounds of SS109/M855 and its still .265
viewtopic.php?f=10&t=19231&hilit=freeze+plug
viewtopic.php?f=10&t=19231&hilit=freeze+plug
I have two hobbies. Shooting and reloading. The more I do of one the more I can do of the other.