My two 25 round Promags showed up. Cycling by hand creates issues that I dont have with the factory 10 rounders, but Ill have to actually go shoot it to really check it.
I have read that sometimes they need to work themselves in a bit...bolt running over the top, etc...
I frog lubed mine, and I am a firm believer in Fog Lube on any part where ther is friction. Lube up the feed lips and the follower. Even lube the spring (rust prevention and lube).
I ordered 2 from MidwayUSA and they are working great. 10 rounder and last round fired chamber stays open. $16.99 and just checked they are still in stock.
Also purchased a 25 round Promag at Rual King in Columbus. It also works great and last round fired chamber stays open. $21.95