Yes, the safety sear holds the hammer until it is tripped by the carrier, the sear being out of the way in full auto mode. Without the safety sear, the hammer would ride forward as the breech bloch & carrier moves forward, maybe or maybe not firing the rifle. ( could fire before the breech block is locked) and we have an excessive headspace problem! The heavier barrel and bipod of the C2 helps control full auto by a bit.Information
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