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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
gas port size
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<blockquote data-quote="Zen Archery" data-source="post: 2865324" data-attributes="member: 60545"><p>27" barrel, wildcat caliber w/ +2 gas. Smith started with #42, .0935, knowing it would be under gassed. I was using a super fast powder and we weren't sure if it needed a narrow or wider port to cycle properly. </p><p></p><p>I worked up to a #38, .1015 to get system to cycle properly without adjustable gas block. </p><p></p><p>Long story short most +2 systems need a minimal of #39, .0995. Measure yours and if it's .0995 and under gassed, go up to #38. If it's over gassed at .0995 get an adjustable gas block and tune it down. </p><p></p><p>As you know there is a wide relationship between barrel length, powder selection, buffer, and buffer spring. Fix what you can fix without drilling. If you have to drill yourself it's super easy.</p><p></p><p>FINALLY BE SURE GAS BLOCK PORT AND GAS TUBE PORT IS PROPER DIAMETER! That's another story for another time. <img class="smilie smilie--emoji" loading="lazy" alt="🤦" title="Person facepalming :person_facepalming:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f926.png" data-shortname=":person_facepalming:" /><img class="smilie smilie--emoji" loading="lazy" alt="🤣" title="Rolling on the floor laughing :rofl:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f923.png" data-shortname=":rofl:" /> </p><p></p><p>Included chart for reference. </p><p>[ATTACH=full]480060[/ATTACH]</p></blockquote><p></p>
[QUOTE="Zen Archery, post: 2865324, member: 60545"] 27” barrel, wildcat caliber w/ +2 gas. Smith started with #42, .0935, knowing it would be under gassed. I was using a super fast powder and we weren’t sure if it needed a narrow or wider port to cycle properly. I worked up to a #38, .1015 to get system to cycle properly without adjustable gas block. Long story short most +2 systems need a minimal of #39, .0995. Measure yours and if it’s .0995 and under gassed, go up to #38. If it’s over gassed at .0995 get an adjustable gas block and tune it down. As you know there is a wide relationship between barrel length, powder selection, buffer, and buffer spring. Fix what you can fix without drilling. If you have to drill yourself it’s super easy. FINALLY BE SURE GAS BLOCK PORT AND GAS TUBE PORT IS PROPER DIAMETER! That’s another story for another time. 🤦🤣 Included chart for reference. [ATTACH type="full"]480060[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
gas port size
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