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Hello, Recently, I sent a brand new Tanfo Stock II over to Patriot Defense for their patented tuneup and barrel reaming. They also installed the extended firing pin, titan hammer, bolo, one piece sear, and Xtreme trigger. Out of the box the trigger was PHENOMENAL, both in DA and SA. Unfortunately, the first range trip was plagued with failure to feeds, and a weird "ca chunk" whenever the slide cycled. After perusing the forums here, it seemed I needed to chamfer off the breechface edge and polish the breechface. I got in contact with PD and they confirmed it was probably the breechface edge issue and gave the go ahead to chamfer the edge while also telling me Tanfo's need a 1000 rounds to break in. They even stated there were no issues when it was test fired at their facility? I chamfered off the edge and breechface little by little like everyone suggested until the failure to feed issue stopped, but the "ca chunk" continued. Thinking this issue stemmed from the wolff 8lb standard recoil spring, I tossed in a wollf 10lb standard spring to no avail and a factory 14lb spring which yielded the same result. After noticing weak ejection with softer ammo and sometimes rounds getting stuck with the slide out of battery, I bought a new extractor with the (9) stamp and an XP extractor spring to cross this off the list (the original had a bunch of machining marks and no (9) stamp). Next range trip, the "ca chunk" continues and within 100 rounds two were somehow stuck in the chamber while the slide was 1/8"- 1/4" out of battery. I had to take the gun apart to get the rounds out since the slide was stuck. This makes me think there is something wrong with the barrel after it was reamed, maybe. The mags I am using are brand new K9s. The issue happens with all mags (12) and all ammo. Everyone that has seen it in slow mo and shot it agrees it's not cycling right. Any thoughts??
Yesterday I encounterd a strange feeding issue with my new stag3g. I would empty a mag, change mag and the first round would partially feed. The bolt would lock back fully and after inserting the mag I would release the bolt, I have a bad lever, that's when the round would partially feed after empty mag, bolt locked back, change mag, releasing bolt to strip the first round from the new mag. Using the forward assist several times would feed the round and lock the bolt. Runs fine from there, no FTE or FTF. I have a Troy designs ambi mag release installed also. Gun is cleaned and lubed with CLP and running a bit wet. I'm shooting pmc .223 55gr, new brass from pmags. I did just spray a bit of CLP in the buffer tube so next time I'll see if that makes a difference. The rifle has perhaps 100 rounds through it. And has been perfect other than this issue yesterday. I've read many posts on ar feeding issues but none really cover this. any ideas.