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12/6/2019 7:27:02 PM
Posted: 12/16/2016 2:52:41 AM EST
I recently purchased an AAC barrel that came with a gas block and tube. Included in the package was two roll pins. One pin that is obviously for the gas tube and another very large pin. I have been unable to figure out what the large pin is for. The LoPro block is not tapped to allow it to be pinned. I'm stumped as to what this pin is for. This is my first build and I just want to make sure that I don't mess anything up. The picture should be attached. All help is appreciated.
Link Posted: 12/16/2016 3:01:22 AM EST
Looks like the right size to be a gas block or sling swivel roll pin. You can always call or email AAC and ask them what the parts are for.
Link Posted: 12/16/2016 3:58:51 AM EST
[Last Edit: 12/16/2016 3:59:48 AM EST by Mike_Deezy]
Could it be a pin for perm attaching the flash hider?

Only reasonable thing I could think of, one gas tube pin, one pin for cross pinning the gas block and another for pinning and welding the muzzle device?
Link Posted: 12/16/2016 5:36:33 AM EST
Of the three pins that are shown there is one for the gas tube, the other small sized one is the indexing pin for the barrel. It wasn't installed when I got it. The large one doesn't have anything to do with the flash hider as far as I can tell. The flash hider was in its own separate package and included Rokset. The large roll pin was in the package that contained the gas block and tube.
Link Posted: 12/16/2016 9:14:40 AM EST
[Last Edit: 12/16/2016 9:14:54 AM EST by Outrider]
Looks like its for pinning the gas block if you prefer that over a set screws. Not necessary but certainly a more bombproof setup. Most gas blocks (outside of Geissele) don't come with a predrilled gas block.
Link Posted: 12/16/2016 9:57:43 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Outrider:
Looks like its for pinning the gas block if you prefer that over a set screws. Not necessary but certainly a more bombproof setup. Most gas blocks (outside of Geissele) don't come with a predrilled gas block.
View Quote


This.
Link Posted: 12/16/2016 12:22:51 PM EST
AAC used to ship those barrels with gas blocks that were drilled for that pin. The barrel and gas block were nitrided after that process occurred.
Link Posted: 12/16/2016 5:51:03 PM EST
Alright so it seems like it's nothing I have to be worried about then. Thanks for the help!
Link Posted: 12/18/2016 8:47:25 AM EST
I ask aac the same question a couple of years ago. They said it is in case you use a different barrel than theirs with their gas block. Don't quite understand what they meant. Seams to small to use as a gas block pin.
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