Help! 7.5 won't cycle
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Help! 7.5 won't cycle
I just built a CBC 7.5in pistol. However, I can't get it to run at all. It fires one round and jams, FTE everytime. I'm using Aquila 150gr FMJ's. I did swap a buffer spring and buffer from a 5.56 gun and at least that did eject the spent round, but didn't pickup another round from the mag. This gun is really undergassed. Any suggestions to help fix this would be greatlly appreciated!
Re: Help! 7.5 won't cycle
Also, it has a Hanker brake on it instead of a standard A2. It’s a CBC industries upper.
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- Silent But Deadly
- Posts: 174
- Joined: Tue Jul 14, 2020 11:08 am
Re: Help! 7.5 won't cycle
How confident are you that you properly aligned your gas block?
Re: Help! 7.5 won't cycle
The upper was all complete. I just built the lower
Re: Help! 7.5 won't cycle
CBC is saying that the Aguila is sub par ammo. Wants me to try a “name brand” to see if that corrects it. Who knows at this point
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- Silent But Deadly
- Posts: 174
- Joined: Tue Jul 14, 2020 11:08 am
Re: Help! 7.5 won't cycle
I'm not familiar with that ammo, but I would expect a properly assembled rifle to cycle factory supersonic 150 grain ammo to at least some extent. The fact that it cycles none of it leads me to suspect that something is off or out of spec.
I could be wrong. I freely admit no knowledge of that ammo, or 7.5" pistol uppers. I do think it's a good idea to try other ammo as a troubleshooting step, but I have a hunch that something is less than ideal in your gas system or buffer system that you want to address if you want that set up to run reliably.
I could be wrong. I freely admit no knowledge of that ammo, or 7.5" pistol uppers. I do think it's a good idea to try other ammo as a troubleshooting step, but I have a hunch that something is less than ideal in your gas system or buffer system that you want to address if you want that set up to run reliably.
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