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Why would I need to buy and aftermarket barrel, I hear this mentioned on some of LWD Barrel M/ Conversion to 38 Super Length 6.02 inch, 153 mm FYI my G40 isn't damaging brass at all. Look up Glock smile. Glock model 40, 10mm to 38 super conversion. | Glock.
EFK Fire Dragon Standard Barrels » For Glock. Checkout This barrel converts your Glock 21 45 ACP to 10mm For Glock 21 40 Super Conversion - SALE. HBCD just like a moon clip on a revolver. These conversion barrels are easy to use and install the same as any other barrel, simply drop it in, no gunsmithing or other modifications are required.