Issue with Lage Upper

[Uniquesnd]

So why would the mags work with the original upper but not the Lage?

 

[Gaujo]

Additional bolt speed is the most likely answer. Let us know when you swap the mag catch or try a stock greasegun mag.

 

[Grant435]

When I put the dual mag catch on, it would make my mags sit too high to were the bolt would hit feed lips of mag or it would lock in the lower position would would cause feeding issues. I put stock mag catch in and everything worked out for me. Like gaujo said, I would try unmodified grease gun mag or try factory mag catch.

 

[Uniquesnd]

I found some unmodified mags, going to buy a couple. May switch the mag catch out
To try as well.