I have an 5.7x28 upper on an AR15 Spikes tactical lower with 3 FN mags and 350 rounds of ammo. I have magpul flip up sights with it. They are sighted in at 50 yards right now. It is the most reliable AR platform I have had. It has a side charging handle and is an ambidextrous shooter and cartridges eject out the bottom of the magwel. If your not familiar with the operating system it is a top loader mag just like the PS 90. If you have any question feel free to text or call. $1150.00 obo 9857747376
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