Customer service at EAA is generally regarded as about the worst in the industry.
Can't feel any burrs inside the mags. I've had this problem with Para mags so I'll try polishing the insides of the mags eventually although I could feel the roughness in the Para mags and eventually succeeded in getting them to work. I did polish off some molding flash from the followers but it didn't help.
This 15 round mag worked fine in my steel frame Witness 10mm. I tried the .40 upper on the 10mm lower (the steel frame slides are cut longer at the rear to match the "beavertail" but the firing pin retainer ends up in the same place) and had some nose up jams in short order. I think there is just too much space in the mag for the shorter .40 rounds to stay put under recoil.
I did order a new slide lock lever and its retaining spring. If I could solve the premature slide lock issue it'd be OK as a range gun with my lead bullet reloads.
It occasionally ejects loaded rounds during shooting, the second photo shows one that didn't quite make it out. This is rare, the first photo shows the common failure (several per box of 50) with full power loads, the premature slide lock is just about every magazine
I contacted Reed's, they do not have conversion kits for the Witness-P guns.
It's not completely worthless, it can always serve as a bad example!
I tried one of the Wolff Para "custom fit" springs (with some fitting top and bottom) in the 15 round mag and a Wolff 11lb extra power 1911 spring in the 10 round mag (I had extras of both on hand). Seems stronger loading the first round, I'll see if it helps next time out after the replacement slide lock lever comes in.
My final test will be to try the 10mm barrel in the .40 slide, it hangs over the front by about 1" but otherwise seems a good fit. This will be my last gasp (using downloaded to .40 S&W level 10mm reloads).
--wally.