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The original AR-15 worked because of tuning for a certain barrel length (to include overall length of the barrel and length beyond the gas port for dwell time), gas port size, gas tube length, gas volume and pressure to a bolt carrier of certain weight, extractor tension, buffer spring coil and tension, buffer length and weight, ammunition type, and magazine type.
We change barrel lengths from 7.5" to 24", gas port position on the barrel from 1"-6" from the muzzle, gas port diameter, gas tube length from 6" to 16", buffers, buffer springs, etc. and expect it to function reliably with ammo from 40gr. - 100gr. fed from 5 to 120 round mags. When it doesn't, it is blamed on a poor design.
A closed gas system (like the H&K), the right ammo and new mags would fix 95% of all problems with the M-16 family. There also needs to be a strictly enforced service life after which weapons need to be replaced.
AM, what you are referring to is sold as the "Pigtail". There is also a larger diameter straight tube called a "Fatboy", IIRC.
TR
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"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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