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Old March 21, 2013, 09:01 AM   #57
dlb435
Senior Member
 
Join Date: January 26, 2009
Posts: 654
The BATF had maufactures slightly modify the old SP1 receiver so that the full auto conversion would not be so easy. This has made the older SP1 design a "collectable".

Last edited by Vanya; March 21, 2013 at 09:25 AM. Reason: discussion of how to convert to FA is off-limits.
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