This is a mirror of a post I made in Shotar's thread
here_________________________
The first box of 500 I bought while en route to Hun's farm in May. Some of the guys there were asking about the strange sand colored "brass" that my RRA was spitting out like day old gum. I went through 500 rounds of it awful quick, and had zero malfunctions. Unfortunately I did not keep track of the lot number. I did find out later that the sand colored ones were the first 300,000 rounds they produced before they switched to gray for the 55 gr FMJ.
I ended up emailing Natec customer service because I couldn't find anyone around me selling it, and asked if they had any retailers around. They sent me two in my area.
My second lot of 500 was a different story. This was .223 rem 55 FMJBT lot #
PCA04 DEC H (stamped inside the box end-flap). It proved to be a waste of my money. This one had the gray casing that is their most current. I took my dad out shooting on Father's Day, and he loaded up all the mags on the way to the range. I'm guessing I got through about 2 or 3 mags with no problem, and I wish I had a camera with me to photograph what did happen, but I'll explain.
After firing, and during the extraction, the polymer casing separated from the brass ass, as I'll call it. The extractor pulled the brass part back but since it was no longer connected to the polymer, it just fell loose in the chamber. I assume this is what happened because it didn't eject, but stayed there and jammed in the chamber lugs when the bolt came back forward. The next round of course comes up the ramp and finds the chamber still populated with the fired, empty polymer casing. Now we have a problem, because it's now jammed. Moreover, the bullet being jammed in the chamber, and the bolt closing on the not-seated round, bends the neck of the round and the casing. Anyways, long story short, I borrowed another shooter's cleaning rod to knock out the round, BUT the polymer stayed in the chamber. It took a while but eventually was able to get the polymer loose and free everything up. After a takedown/inspection, I fired a mag of UMC 55gr through it with no problems.
I tried another mag of the PCA about an hour later, and about a third of the way through it, I had the same exact thing happen.
Now, it was hot out, near 90 degrees, and we were in direct sun, as were the mags. However I don't think this should've been a problem, since the chamber gets much hotter than that. The problem might have been that the round sat in the chamber for too long a period of time from one shot to the next, rather than being rapid fired. The chamber could have heated up the polymer to the point it was
too pliable to be reliable. I didn't shoot any more of that lot, and boxed it up.
Another email to NATEC to bring this to their attention was acted on quickly, to their credit. I had about 350-400 rounds left and told them I had absolutely zero faith in them and would not even fire them for plinking. They shipped me a replacement case, which I have not yet shot, but will be doing so on July 17, our next Illinois crew outing. (I WILL have a camera, I still have some of the bad lot, I will shoot some of it to see if the problem shows up again and will get photos if I can)
I'm withholding final judgment on whether or not I'll be willing to continue to use it for plinking or range, but I can absolutely, positively guarantee that I will NEVER use it when life is on the line.