Originally Posted By Boneyard:
Anyone have luck with 5.56 in this upper?
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New Winchester and some older lake city M193 I used worked fine, only shot maybe 200rds though. lake city 855 also shot fine as well but i only shot maybe a mag or two of it..
Barnaul made wolf steel case also ran fine as well as some random brass cased .223 I had..
I've had exactly zero function issues so far. Charging did seem a bit rough out of the box. So, I lubed it WET and ran the CH maybe 100 times then cleaned and re lubed WET again and it felt much smoother. Doing this may have prevented any "break in" malfunctions..
Overall I'm pleased with the upper. One thing I wouldn't normally recommend is using a BAD lever or in my case a phase5 V3 bolt release.. makes locking open the bolt so much easier and so far has not caused a failure to lock open when the mag runs empty using Gen 2 or 3 Pmags, Lancers, USGI 20 and 30rd mags or even Brownell's 20rd mags like it did on the AR I originally bought it for...