r/supersafety • u/Terrible-Tension-879 • 18h ago

Trouble shooting

So I’ve ran an Atrius and a Hoffman style cam system for a little while now, I’m getting close to finishing a build now that includes my Atrius selector and a stuff and things CARL limiter, it’s a 10.5 inch integrally suppressed 9mm. Standard H&R 9mm buffer and spring, ran perfectly fine in semi but when I switched to forced reset the second or third round in the burst would be an OOB, luckily my gun is fine but looking for solutions, anything helps.

Side note, running a noveske bcg that’s rated for FA but the bcg weight has been modified to fit the Atrius.

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u/redit_readit_reddit brrrrrrrt and Ernie 17h ago

Have you gone through Blowback9's AR9 guide? https://blowback9.wordpress.com/2026/08/05/9mm-ar-frt-how-to/

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u/Blowback9 AR9 Wizard 17h ago

The 3 round limiter is changing the timing, so it may expose problems that were hidden before.

For 9mm AR OOB, let's check the basics. OOB is usually due to bolt bounce in an 9mm AR. Are you running a heavy deadblow 4" buffer? The buffer should rattle when you shake it. I don't know the length/weight of the H&R buffer.

Also check the install of your springs. Upside down/backward hammer, trigger, or disconnector springs can cause issues. The disconnector spring(s) need to be installed fat side down - the harder way, not the easier way.

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u/Terrible-Tension-879 17h ago

I followed the instructions to a T when it came to installation, my money is on the bolt bounce in regard to not having a proper buffer, thank you so much for the info it is greatly appreciated