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The Range
Rifle & Shotgun Discussion
300 blackout upper for Colt 6920 223/556 lower
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<blockquote data-quote="Mad Professor" data-source="post: 3154581" data-attributes="member: 5316"><p>I like my 300blks. </p><p>Your upper selection might determine you success. I have three. 9”, 12.5”, and a 16”. All were built with factory AAC uppers. All three will run factory subs and supers with or with suppressors and function great. </p><p></p><p>I’ve seen several others screw around with stuff trying to make them run. Port size, buffer combos, adjustable gas blocks. etc. The they have to change sometime when they go from supers to subs or run a suppressor. I just change magazines and keep going.</p></blockquote><p></p>
[QUOTE="Mad Professor, post: 3154581, member: 5316"] I like my 300blks. Your upper selection might determine you success. I have three. 9”, 12.5”, and a 16”. All were built with factory AAC uppers. All three will run factory subs and supers with or with suppressors and function great. I’ve seen several others screw around with stuff trying to make them run. Port size, buffer combos, adjustable gas blocks. etc. The they have to change sometime when they go from supers to subs or run a suppressor. I just change magazines and keep going. [/QUOTE]
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300 blackout upper for Colt 6920 223/556 lower
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