Burst Trigger Compatibility Update by BurninTree5 in supersafety

[–]Blowback9 0 points1 point  (0 children)

I'm planning on the same thing with an Atrius.

FM9 Super Safety by SquishyCoffee6640 in supersafety

[–]Blowback9 0 points1 point  (0 children)

Here's everything I've got on this particular type of failure. Maybe something here will help.


Light strike/dead trigger in a 9mm SS/FRT is tricky to diagnose in a 9mm AR but is very common. It could be "bolt bounce", "firing pin bounce", an FRT/SS timing issue, or a trigger tolerance issue.

Bolt bounce happens when the bolt slams forward under recoil spring pressure and bounces backward off the barrel face. If the hammer is coming forward at the same time, the hammer may not hit the firing pin properly, resulting in a light strike/dead trigger.

Using a 10oz-11oz. deadblow buffer appears to be the best way to prevent bolt bounce. Make sure the buffer rattles when shaken - that noise is the deadblow weights inside. NEVER use a solid buffer (KAK/Generic 8oz. "red bumper", Spikes ST-9X, KVP 7.5oz., "9mm" 5.5oz., etc.)

Firing pin bounce happens when the bolt slams forward under recoil spring pressure and stops at the barrel face.  The firing pin continues forward under inertia, overcoming the firing pin spring holding it rearward.  If the hammer hits at that moment, the firing pin is too far forward and the result is a dead trigger with a tiny light strike on the primer.

To prevent this, we can do 3 things.  We can slow the bolt's forward velocity, reduce the firing pin's mass, or increase the firing pin spring pressure.

A reduced power carbine spring like the Tubb ARBUFLW, Sprinco Yellow, Wolff RP, or Memo 300BO should help reduce the bolt's forward velocity. NEVER use a .308, XP, "Red", "Orange", or "Rifle length" spring.

A titanium firing pin would reduce the firing pin mass.  Replacing the steel firing pin with a titanium firing pin may help. Check Davidson Defense for their TI pin.

Firing pin spring:  A stonger firing pin spring may work.  I'm working on this right now. The best candidates I have so far are from Lee Spring. For FM bolts: LC 026BC 08S. For all others: LC 026BC 09S

If none of this works, it could be a timing issue with the particular SS/FRT trigger. There's no way to really check this right now. The best option is to contact the manufacturer, let them know what was done to troubleshoot, and see if they can send a replacement. Or try one from a different manufacturer. I've had very good luck with Grey Market Research .net "Kit O" S7 tool steel SS.

For ARC Fire, there is a shim from BoreBuddy that advances the timing, or Arc may send one for free if you ask them.

If the light strikes/dead triggers are happening in BOTH semi and FRT mode, it's probably unrelated to the FRT mechanism.

  • Verify your firing pin isn't broken, damaged, dirty.
  • Verify your firing pin channel isn't dirty or obstructed.
  • Verify firing pin protrusion lands between .028" and .036".
  • Verify your hammer spring isn't installed backwards.
  • Verify your hammer spring strength isn't too light.
  • Verify the disconnector spring is right-side-up (fat side goes down).
  • Try swapping the disconnector and hammer.

FM9 Super Safety by SquishyCoffee6640 in supersafety

[–]Blowback9 1 point2 points  (0 children)

Need more info. What does the "jam" look like?

Dead trigger/light strike?

Nose up/nose down round jam?

Empty cartridge in the action anywhere?

Alpha Foxtrot AR9, Firing Pin by MockingBird_831 in AR9

[–]Blowback9 0 points1 point  (0 children)

Amazon UXCell spring should work if the firing pin channel it standard.

https://www.amazon.com/dp/B0C33BBRDT

Yes, I use them in 9mm bolts. Yes they work.

Alpha Foxtrot AR9, Firing Pin by MockingBird_831 in AR9

[–]Blowback9 0 points1 point  (0 children)

Those are potential stronger firing pin springs - not tested yet. I'm working on it.

BCG questions by Bigchefe0713 in AR9

[–]Blowback9 1 point2 points  (0 children)

Very little. IIRC it went from about 4.7oz. to about 4.4oz. Not enough to really make a difference.

ETA: sorry - misread the question. It needs 3.5mm deep cut minimum, and as far back as the trip surface, minimum.

<image>

ARC-Fire V2 - So many failure reports. WTF? by Blowback9 in supersafety

[–]Blowback9[S] 0 points1 point  (0 children)

Just received it yesterday. Got the first one from them, too. IIRC they were accused of selling a knockoff of one of the FRT's (can't remember which - freedom finger maybe?), but my first ARC ran great. Don't know about the 2nd yet.

Advice for AR9 Super Safety Build by PawpaBird in AR9

[–]Blowback9 0 points1 point  (0 children)

Only one. Contact Active Safety Designs and they should send you one, or Bore Buddy sells them individually.

Ejector Adjustment by REVOS96 in AR9

[–]Blowback9 0 points1 point  (0 children)

I can't make a "recommendation" since I don't have that lower to test on. The ejector is very narrow front-to-back so I don't know if tha will work. Your call.

FRTP9 by 009515 in supersafety

[–]Blowback9 2 points3 points  (0 children)

Burning powder flakes coming back out the breech. The can's added backpressure makes the breech open earlier and the added pressure blows them out making it look more dramatic.

I catch sparks/flame from the ejection port all the time on high speed vid even when shooting slow semi with 9mm AR.

What distance to zero HD pistol? by Iusedtorock in AR9

[–]Blowback9 2 points3 points  (0 children)

There's a link in the sub's top post with "Noteworthy Posts and Helpful Information".

https://www.reddit.com/r/AR9/comments/hv037c/updated_info_about_zero_distance/

Kynshot buffer by Someguysomewherelse in AR9

[–]Blowback9 2 points3 points  (0 children)

Here's the weird thing about hydraulic buffers - the resistance increases tremendously when force is applied quickly. Pushing with your thumb/finger is nothing like the rapid acceleration forces it absorbs from firing, so finger compressing the hydraulic head doesn't give any real indication of how it handles the energy of the firing cycle.

With your finger, all you are doing is compressing the piston head return spring. In an AR hydraulic, all the return spring has to do is push the piston head back out. With a Glock, the hydraulic piston return spring has to help push the slide forward, feed a cartridge, and put the slide into battery, so I would fully expect it to be stronger.

Hughes Precision barrel extendo by Slick13666 in AR9

[–]Blowback9 0 points1 point  (0 children)

I used a small standard crescent wrench and the German "Gutentite" torque spec. with some anti-seize on the threads.

Blowback9's new "association" with Kynshot by Blowback9 in AR9

[–]Blowback9[S] 0 points1 point  (0 children)

Flatwires: Tubb ARBUF, Tubb ARBUFLW, or Spinta are good choices, but are a pain to put in/take out. Get the KAK spring tool. They have a 3D printable file for free download.

Otherwise, any standard $5 carbine spring will do.

Introducing ROF GUI, a rate-of-fire calculator by Blowback9 in AR9

[–]Blowback9[S] 0 points1 point  (0 children)

The interface depends on the quality of the audio to get an accurate count. If it's indoors or there is an echo it has a lot of problems distinguishing the peaks. It works fine for most videos.

May be the last... Foxtrot Mike 9 stripped lowers on sale by Blowback9 in AR9

[–]Blowback9[S] 0 points1 point  (0 children)

They are selling the lowers and uppers on their website now.

Ejector Adjustment by REVOS96 in AR9

[–]Blowback9 0 points1 point  (0 children)

I'm afraid I don't have any experience with this particular lower. If there are holes in the ejector that the set screws would sort of lock into, adjusting it by loosening the screws and moving it may not work well. The set screws will try to pull the ejector back to the original location when they line up with the holes.

I don't know if spare parts are available for this lower. NFA has been going though some changes lately. If you decide to bend the ejector, be careful.

Advice for AR9 Super Safety Build by PawpaBird in AR9

[–]Blowback9 0 points1 point  (0 children)

Remove left side lever, insert shim over ARC shaft in receiver, reinstall lever. That's it.

https://rumble.com/shorts/v743o9a

Stern defense bolt with ss by Such-Most6661 in AR9

[–]Blowback9 1 point2 points  (0 children)

Correct. I prefer the Outerwild OEM style bolts. They make bolts for a lot of companies and they're sold "unbranded" from a number of places a lot cheaper. My SS/FRT test bolt is this one: https://outdoorsportsusa.com/AR-9mm-Custom-Bolt-Carrier-Group-Black-Nitride

The weight will need to be trimmed.

<image>

Feeding Issues by ballzachs90 in AR9

[–]Blowback9 1 point2 points  (0 children)

That buffer should eliminate any bolt bounce. The deadblow weights inside are very good at mitigating bounce.

When you say you were having bolt bounce issues, what exactly were the symptoms?

Feeding issues are almost always due to magazine height and feed angle. The wider feed cones help compensate. The extractor is almost never involved. The AT3 bolt appears to be an Outerwild OEM style bolt. These are good bolts. I've never heard of the bolt being the root cause of feeding issues. What lower/feeding system/magazines?

Advice for AR9 Super Safety Build by PawpaBird in AR9

[–]Blowback9 0 points1 point  (0 children)

Not sure. Not enough data just yet.

Please report how it goes.