This is such an open ended question. What do you want from the experience? Plug & play, tinkering, versatility, one trick pony, future value, cost, and how much time/money do you want to put into shooting or collecting this new to you gun?
For me personally, my first machine gun was the one I wanted the most. The Colt M16, if I was in harm’s way, that is the gun I would want. My first firearm was a pre 94 that I bought during the National Assault Weapons Ban. It was a Colt SP1. It came to me as a package deal with a Bushmaster six position stock and 16” M4 style upper. The seller also included the original 20” A1 style upper and fixed stock. I would take friends out to shoot, but I wasn’t part of a gun club and I was the first in my friend group to own a firearm. With the extra parts I built a post ban A1 style rifle. With just one rifle, someone would need to wait their turn. That turned out to be quite a rabbit hole.
Down the rabbit hole of configurations I went. I ended up meeting a coworker who owned a couple of M16s. Once I shot that I was hooked. I sold most of my collection to buy a M16. I got into multiple calibers and configurations, but the magwell limits configurations. Then the MGI modular magwell system came out. Over time I was able to find a DIAS, and sold the Colt gun.
During this time I moved to Las Vegas and got to really know “VegasSMG”. I had kitted out the MGI, and started with a”married” Fleming sear converted 94 for subgun matches just before moving to Las Vegas. I had no intention of doing anything with that other than shooting subgun matches. Then the “Going Out Of Roller Locked” sale started. A 9mm reverse stretch, full sized .40 S&W, CA53 AR, and 9 mm SD with a can, along with two .40 SD parts sets with cans later and down the rabbit holes I went. 25 host guns later (most of which are configurations that HK never made), I needed to sell the Fleming sear to fund the dream below.
Vegas was going down the Mac style RR rabbit hole. I got interested when he offered me an Uzi converted M10 and his place in line for a SABER 5.56 upper. Down that rabbit hole I went.
Then the ultimate rabbit hole, what if I were to combine my first love, AR-15/M16 upper with a M10? And the Tenko concept was born.
I will admit that my machine gun journey is not the average. Dealing with the ATF and the whole Tenko saga, has been the biggest challenge of my life. But I am so heavily invested that I don’t feel I can walk away from this challenge. Vegas lobbied very hard for me to walk away. That did put a strain on our relationship. I still miss him very much.
So original poster, what do you want from your experience with your next machine gun? What do you already own? Do you want a pistol, intermediate, or full power rifle caliber experience? What is your budget? Do you want something that you can dump a couple of mags through and then throw back into the safe? Or the opposite end of the spectrum with a crew served style belt fed?
For me, anything with a 100 round Beta C dump, makes me giggle. That could be done with a M10, 53k clone, or a water cooled M16. I am fortunate enough to have most of those options. I do miss my Fleming sear. But I am not in a place where I could kit out my host guns with braces and Super Safeties. Especially when I have stocks to fit them. For me, shooting those host guns with SSs would be rubbing salt in the wound. It would piss me off. Good luck with your next machine gun purchase.
Scott