I purchased 5000 Unis Large Rifle Primers a month ago and 9 out of the 1st 20 rounds did not fire on the first strike. Subsequently, 6 did cook off on the second strike. This is unacceptable performance for any application. The rifle has no mechanical issues and has fired 100% of the time on other ammo. Regardless if these are NATO specification or not - do not waste your money (+$600).