Criterion vs Lothar Walther

[Kohoki]

I do own 4 Lothar Walther barrels on my rifles:

1x 223. 18" AR-15
1x .223 10.5" AR15
1x .300 Whisper 14.5" AR-15
1x 6.5 Grendel AR-15

I am German and I can only confirm excellent quality from Lothar Walther. I had my rifles tested in a German language gun magazine, you can read the articles here:

Black Gold
The Grendel

The best achievable precision of the Grendel was about 8 mm (4 shot group, 100m, fifth shot opend group to 24mm).
The best achievable precision of the 18" was about 9mm (5 shot group, 100m)
The best achievable precision of the 10.5" was about 21mm (5 shot group, 100m)
The best achievable precision of the 14.5 .300 Whisper was about 17mm (5 shot group 100m, 17mm, 110 grs VMAX)

I have to admit that the Grendels quality could only be achieved after a new chamber was cut with a Manson reamer according to SAAMI Spec. instead of CIP.