I have put a few thousand rounds, FMJ as range does not allow JHPs (though I shot 50 JHPs at a different range without issue), through 3 Magpul G17 sized 10 rounders without firing related issues. On 2 occasions I have had the shell casing for the last round get stuck in the feed lips. The gun fired, cycled, and I was able to remove the magazine without issue. The first occasion the casing was caught stovepipe-style by the rim, the second it was seated normally, just empty.
The only other issues I have noticed is that often the ejection of the last casing appears to be weaker than the others, with 17rd magazines (OEM Glock and Magpul) this does not occur, nor does it with 10rd OEM Glock. I've not had issues with them dropping free, either empty or loaded. I have not had any issues that affected their functionality, nothing that has caused a stoppage of fire. I would like an indicator window cut for the 5rd mark in the magazine body, but that's just me and a small complaint.
They do appear to be more dimensionally correct than the OEM 10rders as I've had no issues using them with an ALG magwell, with both standard and the GL-L baseplates.
I have used the following ammo with them
Code:Manufacturer Lot Number Weight
Federal American Eagle AE9AP 124
CCI Blazer Brass 5200 115
Federal American Eagle AE9DP 115
Magtech Sport MP9A 115
Browning Train & Practice B191800092 115
Sellier & Bellot SB9A 115
Speer Lawman 53651 124
Sellier & Bellot SB9B 124
Fiocchi Shooting Dynamics 9AP 115
Federal American Eagle AE9FP 147
Speer Lawman 53620 147
PerFecta (Fiocchi) PF912400 124