Gas ring test is bolt up and holding up on it own weight, not bolt down, and holding the weight of the carrier isntead.

As for B/C lubing, outside of it lubed, and pull the bolt forward to lube the inside of it through the exhaust port as well.


As for problem, would dare to guess using something like Hoppes to clean the rig/chamber, it leaves a residue behind that does not mix well with CLP, add in bullet sealant to the mix, and chamber can get fouled up pretty quickly.

So on that note, first clean bore of barrel with something like Sweets 7.62 to get the copper out of the rifling quickly (and in which is not going to leave behind a residue), then switch over to CLP scrub the chamber with chamber brush, push that mess out of the bore to muzzle (which will leave a thin layer of CLP in the bore for short term storage, and finish cleaning the rest of the rig with CLP, wipe that mess out, and lube the rig with a light coat of CLP in the end.   What you do miss cleaning, the light coat of CLP will do it thing disovling the missed fouling quickly, since CLP does have a cleaning agent in it.

Simply, short of the bore that will need a good copper solvent to get the copper fouling out quickly, the rest of the rig is more like a lube change with CLP.


So problem, not so much with the ammo, but the way you are cleaning and lubing, and with the rig allowed to sit, what every lube you where using, did have enough time in itself to start dissolving the chamber fouling, to allow the spent cases to be extracted again, instead of just foul bound to the chamber walls instead.  Also, if you run into this problem down the road, pull the charging handle back far enough to get the rings in front of the exhaust port, quick shot or few drops  of CLP into the B/C gas chamber section and cycle the B/C a few times.  
Hence don't want to add CLP directly to the chamber, but this migration way of allowing the CLP to make it way into the chamber from inside the B/C, does a great job of keeping the rig running.

No wait for the turn and burn after you have the copper out of the bore in about 3 mins with a few copper brush passed, and just push that blue mess out with clean patches until they no longer come out with hints of blue.  From there good shot of CLP into chamber, few deep rotations with chamber brush in and out to get the fouling out of the there, then push that mess through the bore from the chamber with clean patches until they come out dry still.  Few Q tips to get the last of the barrel extension void clean, and bobs your uncle.    Even with patches coming out dry, enough left on the bore surfaces for short term storage.

If you spray the pulled down B/C with a good shot of clp before you go after the barrel, then by the time your down with the barrel, then rest of the rifle, including B/C is pretty much just a quick wipe down to remove the fouling as well.  Hence should only take about 5 mins to do a detail clean on the rifle.  

As for CLP, the large Breakfree spray cans work the best, and if need to have a small bottle on it, then can just spray that out of the can.

If you have a lot of rigs, and need CLP MIL-SPEC 63460 in larger/less expensive volumes, gallon of CLP for $80 is not a bad way to go if you are going through a few 12oz spray cans a year.
https://fandl.com/radcolube-clp/