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Vertical stringing
Ok, I finally got my version of the 7.62x40 20" barrel to function. It even locks after the last round. Clipped a coil, lightened the buffer and opened the port to .125".
Now, what is wrong when an AR vertically strings groups? I am shooting a 20"+ take off remington barrel that I cut threads on, a high rise upper and a free float handguard. I am shooting on bags. I am shooting less than .75" groups with my 223 upper. I am getting a perfectly vertical group with this one. Maybe .75" x 2" maybe .75 x 2.5". I have gotten some really awesome 3 shot groups but if I keep shooting the groups alway end up stringing vertically.
I seem to remember somewhere I read that it may have something to do with the torque on the barrel nut being too loose or too tight??? Any suggestions??
Chip
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Threaded Mode