I moved a mission first tactical maglink to my Grendel for fun after getting some Magpul ones for my 5.56. I was worried about tension issues on the crappy mags, but got another surprise. Both sides after firing about 5 times and not in the magwell, the top bullet would creep out about 3/8in. I guess it's no big deal if you remember to push that first rd. back. I wasn't expecting that!