ICS CXP & M4 EBB System Revival (ICS-320 M4A1 EBB、ICS-321 M4 . EBB、ICS-322 M4A1 Tubular . L EBB、ICS-323 M4A1 Tubular . S EBB、ICS-324 CXP-08 EBB) EBB (Electric Blow Back system) Spring release function T-Window magazine Ambidextrous charging handle Receiver Locking Pins Split gearbox
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