The only gun I've seen choke was a pistol. Guy just purchased it and was mad it kept malfunctioning. 2 squirting of clp and it never had an issue after.
For an ar, I would imagine ftf due to slow speed and high friction, as well as increased wear. The bolt has to twist and slide in the carrier, the carrier has to slide in the upper, and the buffer has to slide. All are friction points. Lube also prevents corrosion and keeps carbon from sticking.


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