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AR15.COM
12/16/2025 7:57:03 PM EDT
Two different brand G19 style uppers with Brownells upper parts kits (zev/shark coast tact) and OE lowers. I shot a few mags out of both and then had failures. The slides felt rough and I hear a grinding sound when manually racking. No issues with OE recoil spring. Any idea what the cause is before I contact Brownells?

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