FYI:
Crane is recalling the US Military issued 5.56mm SPR rifles to drill and pin the currently set screw retained gas blocks due to problems with the guns - after field use it was determined that the set screw retained gas block was unsatisfactory on a weapon being used by US Special Operations.
Functioning problems were directly related to the gas blocks coming loose - and pinning them as an upgrade to fix the problem is now underway.
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