What kind of accuracy are you getting from your MPX with the 8" stock barrel?

Would you expect accuracy to diminish if you cut the barrel from 8 to 4.5?  The reason I am asking is because I am getting 2-2.5 (absolute best groups) after the cut and 4-4.5 suppressed with the same ammo.  This is done with a rest and 10X Leupold.

I didn't measure the groups before the cut, but they all seemed to be 1 inch or less.  All groups were measured from 25-30 yards.

So, what kind of groups do you get from the 8 inch barrel, and did your groups size change for those of you with cut barrels?  

Thanks.

I had mine cut/crown/thread to 6", and then threaded on a Gemtech Multimount with direct thread. With 147 HST I am getting 1" at 25 yards with a red dot. That bullet is hitting right where I'm point it.
I haven't measured any further, but at 50 yards I hit a 4" swinger every single time with a trijicon MRO from standing.  
I consider mine to be INSANELY accurate.
The only other SBR in my arsenal that can compete is my 11.5" BCM with TREK-T using 50gr Fiocchi Varmint tipped, I'm getting about 1-2" at 50 yards with a red dot (never tried at 25 yards).

I'm going out tomorrow if you have any question I can try and answer? Ill chrono and do some slow shots at 25 and 50 for you? All I have for ammo is 147 HST, 124 HST+P, and Federal 147 9MS though? I usually do a 5 shot group for accuracy but I'll do whatever if you want?

I personally don't think cutting your barrel would effect accuracy, if it was done right. Might have to try different ammo/loads though then from before cutting it?

Personally I like short barrels, I even cut my 6.5 Creedmoor heavy barrel chassis rifle down to 16" and its still a 3/4 MOA gun all day. Barrel length should not effect accuracy at shorter distance, just velocity.

* Honestly I expected the MPX to be about 2-3" groups at 25 yards though, so...

I would think cutting the barrel would not impact accuracy much, except for the shooting position a short barrel will shift you to.