D-Fender
Ends AR-15/M-16 Extraction Problems!
Simply install this small hi-tech composite "D" ring and increase the force of the extractor spring by Four Times! Yes, it's a simple device, but if extraction is your problem, this is the simplest, and cheapest, solution you will find in the marketplace today. Extractor and Spring are not included.

The D-Fender works with the following weapons: AR-15/M-16, AR-18/AR-180, Dawoo 5.56, Dawoo 7.62x39, SA-80, Steyr Aug & Bushmaster M-17 Bullpup