The Colt 9mm Lower is dedicated to the 9mm as the magwell is closed up. There are inserts sold that purport to convert 223 magwells to 9mm for off brands. Don't know how well they work.
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Not true. I converted my Colt Preban AR15 in 9mm to a 223. I poped the 3 pins holding in the mag spacer. Removed the 9mm hammer then I replaced the hammer and added a 20 inch Colt Preban A2 upper and now I have a 223. I sold the 9mm parts.
Pat
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Not true. I converted my Colt Preban AR15 in 9mm to a 223. I poped the 3 pins holding in the mag spacer. Removed the 9mm hammer then I replaced the hammer and added a 20 inch Colt Preban A2 upper and now I have a 223. I sold the 9mm parts.
Pat