Steve Ostrem goes over the two types of magazine springs for the Brownells AR-15/M16 30 round magazine and which one is right for you.
30-Round Gray AR-15/M16 Magazine w/CS Spring 078-000-107
30-Round Gray AR-15/M16 Magazine w/CS Spring, 10-pak 078-000-166
30-Round Gray AR-15/M16 Magazine w/SS Spring 078-000-113
30-Round Gray AR-15/M16 Magazine w/SS Spring, 10-pak 078-000-184
30-Round Gray AR-15/M16 Magazine w/CS Spring, 25-pak 078-000-176
30-Round Gray AR-15/M16 Magazine w/CS Spring, 100-pak 078-000-178
30-Round Gray AR-15/M16 Magazine w/SS Spring, 25-pak 078-000-177
30-Round Gray AR-15/M16 Magazine w/SS Spring, 100-pak 078-000-179
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