KCI mag question regarding bolt hold open

[painter777]

Matt_X brought up a concern to me about the 'Hold Opens'.
Wondering if there were hard on the bolt.
I'd never gave it any thought before.
I have post War 30 rders with Hold Opens, but rarely use 30's.
I boxed up about 40 - 50 GI Parked Mags away years ago. Recently pulled a few and most all I tried acted up.
I can see inside the tubes that the Follower is scraping on the rough park finish. When time allows I've been scuffing the insides smoother. The couple I've finished seem better, especially after a coat of NAPA spray silicone in them. Next trip to the range.... we'll see.