I just got the tax stamp back on a KAC MK23 suppressor and I stopped by PSA Friday and bought a brand new HK MK23. I took it out today to do some factory load testing and then adjust the suppressor piston to try and get the POI as close to the pistol w/o the can as I could.
I shot all factory ammo:
FGMM 230gr
Amwrican Eagle 230gr
Speer 230gr Gold Dot
Win 230gr Ranger T
Win 230gr brown box ball
Hornady 230gr +P XTP
I’ve owned a first year Mk23 and own a HK USP Expert 9mm as well as a couple P7’s, VP9, P30’s...
The older Mk23 I owned would consistently shoot premium ammo into a 2.5” group at 50 yards from the bench. The USP Experts will too. This new Mk23’s best group without the suppressor was around 6” at 50 yards benched. Absolutely nowhere near what I’ve had other HK’s do. I also had a handful of brand new Federal Gold Metal Match cases split starting about 1/3 the way up from the casehead all the way to the mouth. The side where the split is was also visually bulged. I am not home yet to check them with the calipers but it looks like all the brass has a slight bulge on one side and is discolored from powder burn. The bulge also starts around 1/3 of the way up from the casehead and forward. It is not like what you would see in a Glock 40 cal where the casehead/base is not supported. Looking inside the chamber I can see heat discoloration on the chamber wall opposite of the ejection port.
Is it possible I may have a messed up chamber?
I’m not boastful, but I know what I can do with a rifle and pistol. I know when it is me and when it is equipment. When shooting today I would slide back over to my 9mm USP Expert and stack bullets on a 3” shoot n see at 50 yards.
Another thing I noticed with the American Eagle 230gr is every few rounds I would have one that would be wildly off, like 2 feet at 50 yards. That early mfg Mk23 I owned would NEVER do that. Unfortunately I sold it because I want to install an RMR on my Mk23 and I couldn’t bring myself to mill that beautiful prestine maritime finish slide. I guess I should have kept it.
Any insight is appreciated. I figured I’d ask here and see what you guys think it might be before I call HK.
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