Rainman Posted November 2 Report Posted November 2 Recently I had a round jam in my AR-10. When I attempted to clear it, it was absolutely stuck. Essentially I had to strike the buttstock on the ground while pulling the charging handle back to clear it. When the round popped free, a silver ring also dropped out (see attached photos.) I am a relative newbie to this caliber rifle (had mainly been .22LR and .223 ) so I have no idea what this ring is for and how to proceed from here. I am concerned that trying to just load and fire this rifle and an issue occurring. Any ideas? TIA.
Rainman Posted November 2 Author Report Posted November 2 The ring measurements: 0.810" external diameter, 0.620" internal diameter, and 0.140" at it's thickest point. It has a concave shape on one side and convex on the other.
98Z5V Posted November 3 Report Posted November 3 That's a 5/8" muzzle device crush washer, right there. I don't know why it would be inside the receivers, though.
Rainman Posted November 3 Author Report Posted November 3 Ahhh... that explains it. I took the muzzle brake off because I was afraid I would need to completely disassemble the upper and run a cleaning rod through. Thank you!
sketch Posted Wednesday at 05:56 AM Report Posted Wednesday at 05:56 AM On 11/2/2026 at 7:01 PM, Rainman said: On 11/2/2026 at 7:01 PM, Rainman said: Ahhh... that explains it. I took the muzzle brake off because I was afraid I would need to completely disassemble the upper and run a cleaning rod through. Thank you! Did you actually fire a round with the crush washer in the receiver? How is that possible 🤔 I would take it to a reputable gunsmith and have them look it over? *ar10* was this a factory built rifle new or new used?
shooterrex Posted Wednesday at 07:35 AM Report Posted Wednesday at 07:35 AM Did it fall out of the receiver OR did it pop off the muzzle while you were mortering the rifle and went flying near where the brass landed? Did you just take the muzzle device off or did you remove the crush washer also?
Rainman Posted Sunday at 03:34 PM Author Report Posted Sunday at 03:34 PM The washer was still on the barrel. I had just removed the suppressor in preparation for a complete upper disassembly and the suggestion of "mortaring" came up from a fellow shooter. When the rifle hit the ground, the washer popped off (confirmed, missing from the barrel.) Thanks all for the help!
shooterrex Posted Sunday at 05:07 PM Report Posted Sunday at 05:07 PM Never use a crush washer with a suppressor.
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