MPX Brace on UTAS-UT9M?

Ginocide · Apr 3, 2023

So I posted this in Gear & Accessories board but I think this section might be more active and a better fit. I'm looking for anyone who might be able to help me test MPX brace functionality on a UTAS-UT9M, so if you have something like that that you'd be willing to let me test mounting for about 10 minutes, please let me know! Essentially I'm looking to not buy a $130 item just to find out it won't work, so if anyone wants to collaborate I'd be grateful.

The UTAS-UT9M is a newish and neat little large format 9mm handgun to compete in the market alongside Stribogs, and Scorpions, and MP5s. Although it comes with a buffer tube adapter, you can also get a picatinny rail to replace that on the rear, and that allows you to use any variety of picatinny accessories. One thing I've been wondering since I've learned this is if one of those nifty collapsing braces made for sig MPX/MCX guns would work. The UT9 conspicuously has indented channels looking very similar to those on the Sig guns, so it would really come down to if the brace and picatinny rails would allign correctly and if they would have enough clearance. I've taken caliper measurements and it's possible in terms of width, so it really comes down to the vertical placement.

Does anyone have any of these braces to help me test this out? Compatible braces would be the:

Sig Telescoping Brace
SBTactical MPX PSB
the Strike Industries MPX/MCX Stabilizer
Any others I'm not familiar with

ilikegunspdx · Apr 3, 2023

Nevermind

Ginocide · Apr 3, 2023

ilikegunspdx said:
Not sure I follow but if you have a pic rail on the back any of the 1913 folders will work. I have even installed pic rails on the rear of guns that have no pic rail adapters and it works great. It takes about 15 seconds to mount or dismount a pic rail mounted folding adapter or stock/brace. Tons of 1913 stocks and braces out there. If you are talking telescopic I have no info on those.

I am talking telescoping specifically. The folders are OK, but these almost look specifically design for the MPX style. I have confirmed folders work already.

ilikegunspdx · Apr 3, 2023

Nevermind

Ginocide · Apr 4, 2023

Like I said, I already know folders work and am looking specifically at telescoping option now. I've just always liked them.

vagunrunner · Jul 24, 2023

I know I'm late but I can confirm that this particular brace does indeed fit BUT the telescopic function has to stay fully extended, it will not close in properly. It sits just a little off from the grooves to slide in properly. Maybe a slight modification of the pic rail to allow more space but I haven't tried. I use the brace and just leave it extended.

Ginocide · Jul 26, 2023

vagunrunner said:
I know I'm late but I can confirm that this particular brace does indeed fit BUT the telescopic function has to stay fully extended, it will not close in properly. It sits just a little off from the grooves to slide in properly. Maybe a slight modification of the pic rail to allow more space but I haven't tried. I use the brace and just leave it extended.

Hey, that's still cool info. So the arms of the brace don't have clearance? are they too narrow or do they just not line up quite right with the channels on the UTAS receiver?

vagunrunner · Jul 30, 2023

Ginocide said:
Hey, that's still cool info. So the arms of the brace don't have clearance? are they too narrow or do they just not line up quite right with the channels on the UTAS receiver?

The arms don't quite line up with the channels, they are off by a hair, but it's enough not to collapse the brace

ilikegunspdx · Jul 30, 2023

vagunrunner said:
The arms don't quite line up with the channels, they are off by a hair, but it's enough not to collapse the brace

Having not seen it, I wonder if you can grind or sand off a bit on the inside of the arms so they will clear the channels? That way you would be modifying only the accessory and not the gun. I wouldn't sand the whole arms though, only the portion that interferes with the channels, cuz that might create slop when extended.

I did something similar with a mp5 brace. It didn't take much removal to make it work. Can't recall on what gun it was on but it wasn't the brace/stock mentioned in this thread. I hate making irreversible changes to a gun personally but don't mind at all modifying attachments.

Ginocide · Jul 31, 2023

vagunrunner said:
The arms don't quite line up with the channels, they are off by a hair, but it's enough not to collapse the brace

Interesting. Based on what I looked at with the designs, it kinda seemed like if the picatinny rail itself could be moved slightly up or down, that might fix the alignment and let the brace arms travel right along those channels in the receiver. Any thoughts on that?