AR15 Barrel index pin

The indexing pin for the barrel extension? What brand barrel did you buy? Every single AR barrel I bought had a factory installed index pin.
 
I got the AAC 300 blk barrel from brownells. Everything in the description on both brownells and AAC website said its a complete barrel. I open the package tonight, ta-da. Pin is missing. I wonder if a 1/8 roll pin will do? I know it doesn't take or bear a lot of torque.
 
I got the AAC 300 blk barrel from brownells. Everything in the description on both brownells and AAC website said its a complete barrel. I open the package tonight, ta-da. Pin is missing. I wonder if a 1/8 roll pin will do? I know it doesn't take or bear a lot of torque.

No it will not. Get a proper steel pin. A roll pin is insufficient and inappropriate for the job.
 
Contact Brownells and tell 'em that your barrel is missing the index pin and they ought to ship you one.
Or order one h ttp://www.brownells.com/rifle-parts/barrel-parts/rifle-barrel-hardware/barrel-nuts/barrel-extension-pin-prod17535.aspx

Else make your own as Tiriaq pointed out.

OD 1/8" OAL 1/4"
 
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