AR-15 7.62x39 Upper Enhanced Reliability Firing Pin Upgrade
Foreign steel-cased ammo like 7.62x39 and 7n6 5.45x39 sometimes have hard primers that the basic firing pin and hammer spring have difficulty igniting. This firing pin swap should help substantially.
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Gameplay recorded with Avermedia Live Gamer HD
Edited with Sony Vegas 12
Commentary recorded with Blue Snowball Ice USB microphone
Live action video recorded with Samsung Galaxy S3