The second generation of our short throw selector has these changes:

1. Throw arc changed from 45 degree to 50 degree to address a known issue with Wilson TTU triggers

2. Center section (where the flat is) diameter decreased to accommodate triggers with tall rear tang, and some NB coated triggers

Can you guys tell which is which?  The 5 degree increase in throw is almost imperceptible.

There was a little debate about whether to go to 50 degree to fix a problem that affected a tiny segment of the market.  The question came to to this, can we say we've done the best we can, if we don't fix a known problem that some companies would deem acceptable to ignore?

We need to be honest with ourselves.  Leaving this issue unresolved was an option, but a better option would be to fix it.

The discussion to go to a 50 degree took place when we found out about the TTU compatibility issues back in 2011.  The main driving force was actually not the TTU problems, but something else.

The tiny amount of play / wobble when the detent is engaged in the detent holes is about 5 degrees or so.  This is unavoidable, for the detent holes must be bigger than the detent, or the detent can't seat inside the holes.  With a 90 degree selector, a little play isn't a big deal, but with a 45 degree, 10 degree of movement inside a 45 degree arc can be confusing.  And so this was the first reason to go to a 50 degree arch, so the 5 degree or so movement in SAFE and FIRE position is less pronounced.

The reduction of the center's flat area diameter from 0.330 to 0.327 is to further address after market trigger compatibility issues.  In the original design, the diameter was even greater, as that was the milspec.  Milspec doesn't take into account the vast array of aftermarket triggers available, and to the user's detriment, some of them vary a great deal from factory specs.  Over the years we gradually brought down the diameter, now it's 0.327.

This should address the AR Gold trigger's problem.  But to be fair, not all AR Gold, and for that matter, not all TTUs experience the kind of issues the latest revisions aim to fix, I can only attribute this random occurrences with these triggers to variables such as receivers dimensions, and the variances within the triggers themselves.


We can't compel anyone to make their products more compatible with out of spec components, so we do what we can with ours.  This was first started with Geissele Automatics.  In a phone conversation with Bill back in 2010, I asked him why some DMR users had to modify their selectors to work with the DMR.  The short answer is they wouldn't need to do that if their receivers were in spec, but to make a selector more tolerant of out of spec receivers, he gave us the value of the center flat width he'd like to see.  In PIP1 (product improvement program) we increased the width of the center flat section as much as possible based on that advise.  

To this date, every one of the selectors made since August of 2010 had that feature built in, whether a user is aware of it or not.  If you ever wonder why DMR users never mention having to modify our selectors to work, well, now you know  

I have 2 BAD-CASS-ST that I'm having issues with. I have only tried it on a lower with a chip McCormick trigger, now I'm wondering if its similar to the problem you've had with the Wilson ttu.

After installing the selector, its impossible to move it. So I removed the grip and tried it again with just gravity holding the pin...it moved but was still difficult. Any thoughts? I will try again tonight with a standard trigger.

These were purchased in March, and I just got around to trying then over the holiday.

You may have the out of spec centers, please email me with your shipping address, I will send you two replacement centers

Email sent...

Thanks on the quick reply.  I will let you know how I make out.

I'll send you two BAD-CASS-ST replacements.  The BAD-CASS-ST centers are still 45 degree, and they already have the thinner center (0.327), please let me know how the replacements work.  If they're still tight, your receiver's selector holes may be tighter than normal.

That did the trick! They are a little stiff, but seem to be loosening up the more I cycle it.

Thanks again.

The raised detent groove is supposed to do increase spring pressure exerted on the detent, as the first generation was deeper, and a few folks had mentioned it was mushy

Duffy,

Does this mean I can get a replacement for my prototype?

http://www.ar15.com/forums/t_2_404/223731_Wilson_TTU_MIL_50_Degree_Lever__.html

Yep, we should have 50 degree BAD-CASS-STs next week, please email me your shipping address and I'll send you the production version

will these work in a regular lower? or does it reguire the notch?

For liability reasons, we make the ST selectors incompatible with standard 90 degree marked lowers, by way of pressing a "lawyer pin" on the selector center.  A 45/90 degree compatible lower will have the notch on the left side of the selector hole to allow the pin to pass through, such a receiver will also have the correct FIRE engraving suitable for either a 45 or 90 degree selector.

The pin's only purpose is to prevent users from installing it on a standard receiver.  If the pin is removed, it could be installed, but doing so will void the warranty.

well got my center piece today , had to void my warranty but loving the 45 degree. now to wait for the center ass to come back in stock.

have you thought about designing a center piece that allows both 90 and 45?

We have indeed.  We cannot and will not sell a short throw capable selector or center without the "lawyer pin", and the pin makes it impossible to design a reversible and convertible 50 / 90 degree selector center

I just received my 50deg cass and it is not working with my ar gold trigger.  It won't make ready...

AR Gold has its own feature that may require shaving off the rear top tang of the trigger, this is a well known issue, whether it's our 45 or 90 degree, or other selectors

Thank you for the reply.  I couldn't justify taking material off the trigger... I polished the selector since I had already voided the warranty.  Works as it should and my $270 trigger wasn't touched...