re:
Since you've had a few ejection failures...stovepipes...it might not be a bad idea, even though they probably weren't caused by the rough edge.
The mag spring also needs to be up to par. I strongly recommend the Wolff 11-pound springs with traditional 7-round followers. The +5% springs are designed for the folded Devel 8-round followers, and while they provide a little more tension, they don't keep the 7-round follower stabilized as well as it should be.
Metalform will sell the standard followers as components. The Brown magazines were probably made by Metalform, and likely made to work with the proprietary follower...and may not be optimum for use with the standard follower...specifically in locking the slide on empty.
You can check for it. Load one round and look at the front of the magazine even with the top of the follower. It should have a very slight concave shape just at, or just slightly above the top edge of the follower. If it's not there,
the standard follower may "walk" to the right when the shelf engages the slidestop lug, and ride over it. While it's possible to put that inward curve into the magazine, it's easy to screw it up if you're not careful.
If you want to try, load one round into the mag, and use a slot-tipped screwdriver to put a very light indent at the bottom of the case's tangent...and I mean very light. All you want to do is put a slight curve in the mag body a bit above the top edge of the follower to cause it to be pushed into the slidestop lug as it engages. If the lug is correctly angled at the bottom edge, it should pull the locking shelf to the left and into it. Every Brown slidstop that I've seen does have the angled lug. Assuming that the follower shelf is also within spec, it'll be captive and engage positively.