Honestly, a little disappointed with this product-Price certainly doesn't reflect quality; very tack plastic, and struggles to feed and click in, often needing to wiggle it to feed, and after hardly using it much the feed coil has gotten weak, making feeding even worse, and definitely can't keep up with higher ROF.
If this was priced lower, I wouldn't feel so let down, but it's the only option for large capacity mags and rather expensive.
- Now considering modding a more reliable MP5 sized drum to work, or find an upgrade winding/feeding coil.
If you've got the money to spare, go for it, it's fun and practical on the field, you may have some luck with it, but if you're expecting flawless function, give it a pass.