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Discussion Starter · #1 ·
I've read that drums don't play well with these without cutting up the magwell, and I don't plan on doing that. That said, are there any 20/30/40 rounders that don't work well with the 556Rs that I should stay away from? Especially interested in picking up a couple 20 and 40 rounders that are good to go, but don't have enough experience with this caliber in general.

Any info would be appreciated!
 

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I have a Gen-2 556R. EVERY magazine I’ve used had to be modified to fit the magwell. I emailed Magpul about it and the reply I got said that their magazines fir the 556R that they had. They told me to file off the rear lug as needed off the mags.
 

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For me the original Tapco obviously work, I didn't need to modify magpul mags, or Bulgarian steel mags.
The only mag I needed to modify are the US Palm's, the waffling near the top wouldn't fit the magwell, a little work with a Dremel fixed it.

Sent from my SM-N986U using Tapatalk
 
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