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Will this upper work on a pre-ban AR15-A2 with the large diameter screw together front pivot pin? — 1 Answer
by Donald, from NC, United States Asked on January 28, 2020
If you use a Push Button Front Take Down pin that passes all the way through and with pop out bearing, you could fashion an adaptor to fill the gap between Larger Lower mount hole and locking pin. Brass tubing could probably be fashioned to fill gap. Some outer grinding or inner drilling may be required. I have a Front Pin Adaptor for using Large Hole Uppers to new version Lowers. I'm not aware of an adaptor for the other way.