Glock, OEM Glock 21 Gen 4 Threaded Barrel, 45 ACP, M16X1LH Thread PitchFactory Glock 21 .45ACP threaded barrel. Compatible with Gen 1-4 Glocks. Threaded 16x1 LH. Comes with tread protector. This is a drop-in, hammer forged, suppressor ready replacement barrel for your Glock 21.
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