M60 machine gun, 50 cal, and Mark 19. Did you like the reserves better or worse than active duty?
Sounds like you fired some real bad ass rifles!
Hard to say which was better/worse.
On active duty, I had a stable pay check and routine, etc.
Plus, I really liked being identified as marine and the basic "esprit de corps" bonding in the corps.
Ya know, everyone is in the same marine boat and pulls together , etc.
Being active duty felt more like a life style then a job.
Like you I was a college student during most of my time in the reserves .
My 1st reserve unit was an armored ( tank/infantry) Bn. I enjoyed doing that and felt like a real marine.
However, after a couple months I was suddenly transferred to an air wing reserve unit.
It was a bit more distance , so I got extra per-diam, but worked doing admin and cpu stuff.
In all modesty, my ASVAB score was in the top 1%, so I ended up being "volunteered " to do "office work, cpu data* entry" etc
35-40 years ago, the USMC was transferring personnel data to a DOD computer based system.
I was part of a group that was trained in Kansas City on basic DOS to input data and write basic programs to assist.
I'd like to brag and say it was some top secret, high speed stuff, but it was pretty tedious and mundane.
To fully answer your question, I found it awkward going back and forth between college life and working as a part time marine.
I almost joined the US Coast Guard, the spring ( April 2002) after 9/11.
I was running in this big 10k race in New Orleans and they have a mega fitness expo.
The Coast Guard reserve was recruiting and using my prior service time , I was under the age to get a commission .
I was pumped to be an XO ( exec officer) on a Coast Guard rapid deployment gun boat.

But, since I already had plans to move to N. Ga , I opted out and always had some regret.
I worked out in the same (La) gym with another ex-marine who had become an active duty coast guard officer in the 90's.
I enjoyed hearing about his work and thought it sounded like a great career .
Alas, I never followed thru and ended up staying with a decent career of teaching physics. I recently retired after 30 years of it.