magazine causing feeding issues?

[SNAKEDOCTOR1911]

I had a problem with failures to feed. Rounds were being driven straight into the base of the feed ramp and jamming. Bending the feed lips up slightly seems to have fixed the issue, but could use any other input.

[LRRPF52]

I've seen this problem with at least one mag that had the feed lips formed wrong. It caused the same issue you're experiencing. Using a functional magazine as a reference guide, I bent the lips up, and problem solved.

[vanguard138]

I have run into this issue on a few magazines. Somewhat hesitant to bend the lips for fear of adjusting them too much. Does anyone have any guidelines or suggestins on this? Pretty good shot and getting comfortable at reloading, but I was an oxymoron in the Army:-)

[LRRPF52]

You have two basic options currently:

1) Send the magazine back and ask for a replacement.
2) Modify it yourself until it works.

[ss355]

I took a new, AA-marked mag to a shoot last year and ran it for the first time. Pulled the mag out of the plastic wrap, loaded 25 rounds, and started shooting. I got failures to feed every other round. After three failures, I pulled the mag and first looked at the gun. Didn't see anything obvious, so I examined the mag feed lips. One was obviously bent. Got a pair of pliers from the range kit and adjusted the feed lip as best I could. The mag ran fine for the rest of the shoot. I figure what happened was that the mag got dropped at some point during its lifetime and the feed lip was bent. I believe I was the third owner of the mag, so it's not surprising that something like that could happen.

[LRRPF52]

That was the same issue I saw on a 17rd mag that another Grendel owner had. Left lip was fine, and would feed fine from that side, bu the right lip was straight, with no incline to orient the cartridge into the chamber. I bent it using insulated pliers with plenty of duct tape, and that solved the problem.

These mags were all made by CProducts, and I suspect a QC issue, especially with the consistency in this particular problem. There is a lot more uniformity in USGI contract aluminum 30rd mags, and they seem harder too.

[Variable]

I went through a lot of Cproducts Grendel mags back in the earlier days and they were all over the map for dimensions. I had to bend feed lips on some of them and even smash bodies smaller with clamps for some of them that were bowed out so far that the tail of the spring would slip out between the mag body and the floor plate.

The main problems as best that I could guess from looking at them--- They were stamped out correctly (good dies), but the jigs were off/sloppily adjusted for welding. Some were wider at the front and some were wider at the back. Warpage during heat treat seemed to be an issue as well. The only thing to do was bend them until they worked, or return them as LRRPF52 said. I hate shipping stuff, so I bent all of mine.

Quality seemed to go up on average over time, and some folks had zero issues while others got bad ones. The last batch that I bought had no apparent issues at all with the 25 rounders, and the 17 rounders were pretty crappy. My best luck out of the bag was always with the 10 rounders. I haven't bought any mags over the last four years or so, so I couldn't say how much has changed. I have noted that far less complaints have surfaced lately though.

One thing I will say about the spring steel that they use--- They are pretty darn durable once you get them working right. My buddy ran over a loaded 25 rounder in his gravel road (dropped off the 4wheeler earlier) with a Ford sport trac and it held up well.LOL Some rounds had popped out and it was scarred up but it still functions fine to this day. To get the ones that I had that were bulged bent enough, I had to take a large padded clamp and squeeze the sidewalls until they were touching each other. They typically just spring back. You really have to squeeze them to get them bent!

[vanguard138]

Thanks. My issue was with the 17 round C-Products. So at this point there is nothing to lose by trying to tweak them. I did get a couple new followers from the new company and that corrected the problem in one mag but not the other. Sems the design was just a bit different with the new company.

[LRRPF52]

The 17rd CProducts mags have been the biggest culprit in feed issues. The 10rd and 25rd mags have very few complaints from what I've noticed. I have a 17rd mag that I have used since the beginning with only 3 and 5-round groups, thinking it was 100% reliable, until I loaded it with 10rds. Then it choked. I should just block it off, and check the other one for 5+ rounds reliably.