So far as I know, the only Quad-50 mounts in Korea were on half-tracks. The 50th AAA had 32 of those, and 32 M-19 "light tanks" with twin-40mm turrets. Tracking capabilities for crossing planes was up to 200mph, not real helpful on Migs...
2nd Inf. guys said the Quads were great against human-wave attacks, but you had to move out after 10 to 20 seconds of shooting, to avoid mortars. Shoot and scoot, shoot and scoot...
Joe Chink's "waves" had the first wave with full-auto; second or third had bolt action; and the rear waves were expected to arm themselves from the fallen. If he didn't have his pack and rice bowl, there was a chance of stopping them. With pack and ricebowl? Forget it; they'd expend a battalion to over-run a squad. (Hearsay from guys who were there; I was on occupation duty, Class of '54.)