This barrel is a threaded barrel for the Elite Force Glock 19, allowing all sorts of attachments.
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Pro-Arms Elite Force G19 threaded Barrel Black - Airsoft Extreme
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Pro-Arms Elite Force G19 threaded Barrel Black - Airsoft Extreme
Airsoft Action - February 2022
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Pro Arms threaded barrel for Elite Force G19X/G45 - Airsoft Extreme