POI shift varies with ammo selction too when using a suppressor.
When I bought my NT4 a little over 4 years ago, I had a lengthy discussion with Lt. Col. David Lutz at KAC about POI shift, cans etc etc. Mr. Lutz offered to test some NT4's on my LMT 10.5" upper for me (talk about customer service!). He fired 2 different kinds of ammo, Mk262 and M193, from 100 yards. The shift between suppressed/unsuppressed with the Mk262 was 5/8 of an inch, and with the M193 the shift opened up to 2 inches.
When I recieved my upper back from KAC, Lt. Col. Lutz included the "M110" qual targets that he used during the test, detailing the rounds between suppressed/unsuppressed and poi shift. The targets are still in my safe. Needless to say, I was very happy with the results, the cs of KAC, and continue to be impressed with my "hand picked" NT4.


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Gotta rib you Dave.


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