[ShootingSight]

I was playing around with my tool sets, which include a T25 and a T20. Every screw I saw on the 17 was a T25 or a 2.5mm hex. I could not find any T20 screws, yet the FN tool includes this tip, so it should fit somewhere.

Also, the armorers tool includes a small flat blade screwdriver that I can't seem to fit anywhere. It's too big to fit the safety selector screw, and I don't see any other slotted screws anywhere ...

So what do these tools fit?

 

[SONYtec]

May be used on the 16...

 

[SONYtec]

Oh... IIRC the front sight uses a T20 for the windage adjustment.

 

[ShootingSight]

Nope, FS is also a T25, at least on my 17. I sold my 16, so maybe that was it.

 

[SONYtec]

Ok, that's what I'm thinking of.

One of these days, I'm gonna have a 16 and 17...

 

[Rypht]

Maybe the tool kit is geared to provide support for the entire SCAR line? Could those tools be for the EGLM?

 

[ShootingSight]

So the mystery deepens:

The instructions with the armorer's tool kit say that the tool includes a screwdriver and a T-25 bit, but when I pull out the calipers and actually measure it, it is a T-20. It'll still fit in the T-25 opening, but the engagement is not right, and it could strip it out.

There is also a square drive socket with a T-25 bit in it for the torque wrench, and that one is a T-25, as advertised.

Bottom line, I still can find no application for either the T-20 bit, or for the flat blade screwdriver. It is too big for the selector screw, and there are no other slotted screws I see on the rifle anywhere.

 

[Rattyxj00]

Just a guess, but ----Scope mounts, perhaps?

 

[kneedeep]

The tool kit and cleaning kit were not designed for the civilian versions of the SCAR, so it is possible that there is a use for the T-20 on some Mil variant. Having said that, I did thoroughly search the SCAR Operator's Manual and find no mention of the T-20. The flat blade bit is mentioned specifically for pressing the detent in when assembling/disassembling the gas regulator.

Since it is not mentioned in the operator's manual or in the toolkit's instructions, my theory is that a batch of the tools were accidentally assembled with the wrong (T-20) bit instead of the T-25, or they were actually built for some other purpose than SCAR maintenance.

 

[akitainu]

This probably isn't any help, but I was looking at the FN Catalog , and while it isn't the SCAR, there was this:

Ballista

™
QUICK DETACH FOREARM
Removable forearm fits the Ballista
™
Chassis. Quick detach
removes in seconds without tools. Features advanced polymer
construction and has airtight storage space for spare CR-123
batteries. Includes T20 and T25 wrenches for barrel removal, rail
movement and advanced maintenance. FDE in color.

 

[ShootingSight]

The fact that the operator's manual identifies the tool as a T25 (including pictures with arrows pointing to the tool, so I am not misunderstanding), while I disassembled it and the bit is stamped T20 makes me agree that it was likely a manufacturing screwup. A T20 will fit a T25 bolt, though not with great contact, so it might have been out there for a while before anyone realized it was the wrong bit.

The screwdriver might have been added to the tool early on, and got 'repurposed' when a slotted screw was no longer needed. To go to the effort to weld on a socket, to add a flat blade, and yet the only referenced function of the flat blade is to push down the detent as you unscrew the gas valve is not logical .... unless the the tool designers were told 'have a sharp edge' and no one questioned that the edge of the tool handle would have been more than adequate....

 

[ShootingSight]

Problem solved. I talked to FN. Nothing needs a T20. Best hypothesis is that someone damaged the tip and replaced it with the wrong one.

No idea on the decision to add a screwdriver tip when the only thing it does is depress the detent to open the gas valve. There are easier ways to accomplish that.


Art Neergaard
ShootingSight LLC
www.shootingsight.com
[email protected]
513-702-4879

 

[Grinder]

Just checked my kit and both are T25s