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  1. 556 Discussions
    I recently mounted an Aimpoint Comp M4 on my 556ER, she’s an early JS 0050xx, made in July of 2007. After sighting it in for a basic battle sight zero using XM855 62gr ammo, and shooting off of a few pillows for a rest, I was very impressed with the accuracy. After getting things dialed in and...
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