Just received my Stag 6.8 SPC, everything seems good, but it is a little tight. The bolt is not fully locking into battery if I ride the charging handle. I cleaned it up and it seems a bit better. I have heard some of the Stag upper had some head spacing problem. I have 4 other 5.56 builds and never experienced the tightness. Hoping it is just too new. I'll test it out next range day and see what happens.
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