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Page AR-15 » Troubleshooting
AR Sponsor: bravocompany
Posted: 8/8/2024 8:57:05 AM EDT
I work as an armorer at a local gun range. I have experience with AR's and have built many, all of which function perfectly. He complained it wasn't cycling, told him to leave for inspection. Specs are as follows 7.5" barrel chambered in 5.56 1/7 twist(unknown manufacturer), pistol length gas running a standard carbine buffer and spring. Upon inspection I noticed several issues, A2 flash hider was not torqued and crush washer was installed backwards. Low profile gas block not secured(barrel was dimpled) and barrel nut was only hand tight, no torque and anti sieze were applied. I reassembled the upper correctly and test fired. I still can't get the bolt to lock back on an empty mag.
It fires extracts and ejects the empty brass but does not load the next round. My next step is to try a lighter spring or remove a weight from the buffer. Please feel free to chime in with any other suggestions.
Link Posted: 8/8/2024 9:55:56 AM EDT
[Last Edit: Normlizer] [#1]
Did you check the gas rings?  What ammo did you test?
Link Posted: 8/8/2024 10:30:10 AM EDT
[#2]
Gas rings are fine, ammo was Lahab 5.56, that's all they had at the range.
Link Posted: 8/8/2024 11:00:03 AM EDT
[Last Edit: WUPHF] [#3]
What does ejection look like?

Can you pin the gas port to check size?
Link Posted: 8/8/2024 11:06:52 AM EDT
[#4]
ejection is about 3:00 to 3:30, I can mic the port when I get back to work on Saturday. Its puzzling, gas tube is free from obstruction, I'll double check the gas key to make sure it's clear.
Link Posted: 8/9/2024 8:22:32 AM EDT
[#5]
Link Posted: 8/10/2024 2:14:55 AM EDT
[#6]
Page AR-15 » Troubleshooting
AR Sponsor: bravocompany
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