Fixed: 18" Alexander Arms barrel: 2.5+ MOA

[c3k]

Barrels can not rotate in the barrel extension after they are assembled. Once they are installed they are pinned to the barrel.



They cant rotate without shearing the steel pin. If your barrel rotated in the extension then it was not assembled correctly by the barrel manufacturer. The pin was probably not pressed in properly or the barrel was not drilled deep enough for the pin. Can you post a pic of the barrel extension and pin? It would be interesting to see how far the pin is protruding from the barrel extension compared to the pic above.



I cant believe Alexander Arms would give you this advice. It needs to be headspaced, timed and pinned.

Yeah...all this.

I sent it in, so no pix. The extension pin only flattened the threads on the barrel. The pin did not protrude any more or less than other barrel extension pins I've seen. It certainly did not interfere with the barrel nut being spun on.

There was NO drilling. The pin looked like it had been tapped into place and it flattened a few threads. It may have been pressed, or it may have been lightly hammered. Regardless, it obviously was not securing the extension to the barrel.