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AR15.COM
8/8/2008 8:08:26 PM EDT
any difference between the one of two shipped with my upper and a standard a2 spring?
8/9/2008 6:35:14 AM EDT
[#1]
If using a rifle extension, try it with your regualr rifle spring first.  If you have issues, try it with the longer/heavier spring sent with your RRA.  We only did that to help eliminate some cycling issues as there are loads for .458 SOCOM from 250-600+ grs.  Not all will function with standard springs (or even with the heavier one included) but it will allow a larger range of loads without having to mess with gas ports, etc...
Steve/RRA