Binary Firing System

MightyWarMonger · Jan 10, 2016

I did a search and didn't find anything and I wasn't exactly sure witch section to post but it seemed appropriate here. So here is the LINK to an article for this BFS drop in trigger. I could use the hell out of this but their are some down sides that I see 1. How it's cleared through the BATFE I don't know and wouldn't buy one without and BATFE approval letter as 2 rounds are fired per trigger pull. 2. you either have to buy that lower or pay a gunsmith to install your trigger group so that's an added cost on top of the already pricey $400. 3. He had allot of malfunctions and hes an experienced shooter, I don't know if a lighter bold or full auto bolt would help with malfunctions or maybe a stronger buffer spring or some combo of the two. it would be something I would like to play with but at the cost of 5.56/223 it would cost allot to feed that thing on a regular basis as well as having somewhere to shoot it most ranges wont allow you to shoot like that.

Melnic · Jan 10, 2016

yea, its called a failing disconnector.

$400 for a switch to make your disconnector not work.

I got an out of spec disconnector, While doing a bench test, that's what happened.
Fired when I released the trigger.

Not 2 weeks later a person at the range was having same problem. Sure enough, disconnector spacing was off. I just happened to have a diamond file set and we fixed it.

dontpanic · Jan 10, 2016

They have a BATFE letter for it.

It seems like a fun toy, but $400 is a lot for a toy.

Also, we have been discussing it here

http://www.mdshooters.com/showthread.php?t=187335&highlight=Franklin+armory

Pinecone · Jan 10, 2016

Does not fire two rounds for one pull.

One round for one pull, one round for one release.

Separate actions.

protegeV · Jan 10, 2016

Dupe.
And this doesn't belong in the nfa section anyway. It's not an nfa item.

http://www.mdshooters.com/showthread.php?t=187335

ken792 · Jan 10, 2016

Seems like a waste of money when you can simply grind down the hook of a disconnector and do the same thing.

Also, you could use a burst trigger group to create the exact same thing. One disconnector will be for regular semi auto, and the other would be for binary firing. The selector will switch between them.

Pinecone · Jan 10, 2016

ken792 said:
Seems like a waste of money when you can simply grind down the hook of a disconnector and do the same thing.

This one, as I understand it, allows you to reset to standard semi auto, shoot on pull only.

ken792 · Jan 10, 2016

Pinecone said:
This one, as I understand it, allows you to reset to standard semi auto, shoot on pull only.

You can do the same thing by using a burst trigger group. From the MAC video, it has two selectors and a three position selector, so it would work the exact same way.

teratos · Jan 10, 2016

ken792 said:
You can do the same thing by using a burst trigger group. From the MAC video, it has two selectors and a three position selector, so it would work the exact same way.

Really? It would be nice to do this with a Geiselle trigger or something similar. Not sure if any of their FA triggers are burst.

ken792 · Jan 10, 2016

teratos said:
Really? It would be nice to do this with a Geiselle trigger or something similar. Not sure if any of their FA triggers are burst.

Burst triggers have two disconnectors inside them. One has a selector tail, and the other does not. For the right side one without the tail, you'll want to file back the hook slightly so upon the release of the trigger, it drops the hammer before the trigger catches it. The one with the tail will act as a normal semi auto disconnector. In the middle selector position, neither disconnector is disengaged, and the left one with a tail provides regular semi auto fire. When the selector is in the third position, it disengages the left one, and the right one with a shortened hook provides binary fire.

I can't imagine this BFS trigger group working any differently.

Three position burst disconnectors on the left.

BTW, here's an old ATF letter from back in the day when the "staple mod" was popular with Ruger Mini-14's. People would modify them by placing a staple or similar thin wire under the disconnector to space it back slightly.

teratos · Jan 10, 2016

ken792 said:
Burst triggers have two disconnectors inside them. One has a selector tail, and the other does not. For the right side one without the tail, you'll want to file back the hook slightly so upon the release of the trigger, it drops the hammer before the trigger catches it. The one with the tail will act as a normal semi auto disconnector. In the middle selector position, neither disconnector is disengaged, and the left one with a tail provides regular semi auto fire. When the selector is in the third position, it disengages the left one, and the right one with a shortened hook provides binary fire. I can't imagine this BFS trigger group working any differently. Three position burst disconnectors on the left. BTW, here's an old ATF letter from back in the day when the "staple mod" was popular with Ruger Mini-14's. People would modify them by placing a staple or similar thin wire under the disconnector to space it back slightly.

Thanks for the explanation. Looks like rolling your own isn't an option.

protegeV · Jan 10, 2016

teratos said:
Thanks for the explanation. Looks like rolling your own isn't an option.

Why not?

The letter specifically states that "a firearm that shoots once upon pulling the trigger and once upon releasing the trigger would not meet the definition of a machine gun..."

Then they go on with vagueness about other modifications which could be nfa violations.

The legality of this trigger, or making one yourself, seems clear cut to me. Even better that the letter is 12 years old and they haven't changed their mind.

teratos · Jan 10, 2016

protegeV said:
Why not? The letter specifically states that "a firearm that shoots once upon pulling the trigger and once upon releasing the trigger would not meet the definition of a machine gun..." Then they go on with vagueness about other modifications which could be nfa violations. The legality of this trigger, or making one yourself, seems clear cut to me. Even better that the letter is 12 years old and they haven't changed their mind.

Certain modifications can still classify it as a machine gun regardless of function. FA selector, FA disconnector.

protegeV · Jan 10, 2016

teratos said:
Certain modifications can still classify it as a machine gun regardless of function. FA selector, FA disconnector.

I get that. But simply modifying to fire on press and again on release of the trigger, per the letter, should not be a problem.

SCARCQB · Jan 13, 2016

Got several weeks of waitING before FA ships out the triggers.

But I'll wait. One is going into an older, but upgraded SBR.
The other on an ARES MCR.

Both should be fun range toys.

erwos · Jan 13, 2016

If this thing could be put into "burst mode" by switching to the third selector position, I'd buy one. Not sure I'd want it as the permanent setting.

Gambler · Jan 13, 2016

The question we are all wondering is, should the un-squeeze surprise you?

tkd4life · Jan 13, 2016

erwos said:
If this thing could be put into "burst mode" by switching to the third selector position, I'd buy one. Not sure I'd want it as the permanent setting.

FYI, that is what it does. The semi mode only fires one shot per trigger pull and release, while binary mode fires one shot on trigger pull and another on trigger release. One complaint was however that the semi mode has a really long reset.

Sid. · Jan 13, 2016

One of the videos on YouTube shows that you can negate the second shot by holding the trigger and switching the selector to Semi.

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