ST-22 feeding problems. AR 22 conversion upper.

[Trakker]

Does anyone thick BDM mags can benefit from having some more lift to the cartridge in the feed lip area?
If you compare the Ciener / GSG-5 / Advantage Arms 22 conversions mags, they tighten up a bit at front of the feed lips.
This seems to take advantage of the rimmed cartridge and helps provide more "lift" to align the cartridge to the bore axis.

I think if they did this, a lot of feeding issues (FTF) can be resolved.

FTE / Extractions issues appear mostly related to extractor spring and extractor shape.

[One Shot, One Dropped]

Based on the title of the thread ("ST-22 Feeding Problems. AR 22 Conversion Upper"), I would assume you are having issues with your Spike's Tactical ST-22 Upper.

Most of those uppers tend to run most reliably off of Federal (Champion?) ammunition. Anything else is hit or miss. Have you tried Federal?

[Trakker]

Tried federal, very reliable.
However, I have a boat load of CCI minimags, and would like to make the upper more compatible.
My GSG-5 is more reliable with various ammo.
So is my 10/22 which DOES NOT have a feed ramp.

[jchen76@gmail.com]

I have some 2k of 40gr Minimags that will feed in my Spike's upper. Federal is very reliable.

Spike's is aware of it, here's a guide posted by them for tweaks to feed more reliably.

http://www.ar15.com/forums/topic.html?b=2&f=282&t=173040