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Put my 300/221 AR15 together
I finally got my RRA match lower put on my Model 1 upper. I built 400 cases out of 5.56 cases, cut, formed, ect. I took the rifle out to the range on Sunday and it is short stroking. I am new to the AR platform, so bear with a little please.
It is short stroking, it extracted every case after firing, but the bolt closed on an empty chamber. At the end of my 5 round magazine, it did not lock open but closed on an empty chamber.
I cleaned it up today, the gas tube and key seem free. I couldn't tell if the pipe cleaner went in to the barrel, but it did pass through the key. I moved the gas block to check the hole, it's right at 0.120". There is a band of sliver where either the barrel didn't get coated or the coating has warn off. That band is just slightly wider than the hole in the barrel leading me to believe that the block's hole is atleast 0.120".
So do I need to cut the recoil spring or should I invest in an adjustable gas block? Is there anything else I can do to correct the short stroking?
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