Don't get bit by the belted or tactical big bore bug, trust me.
HTI w/Elite Iron can and brake (not shown) indexed TDC w/o shims. USO 5-25x in Badger rings, PVS30, LRA bipod and Insight PEQ. The first time I fired this I forgot to put on the ear pro and almost finished off my hearing; can wasn't on it, brake was. The tinnitus is still worse than it used to be. The second time I got fucking scope bit. 12ga. recoil my ass, this is NOT a Barrett and I understand now why people load such anemic loads for these. I moved the scope up a notch for better use in the prone and I won't be forgetting the ear pro again, can or not. Go ahead, laugh, it's why I mention it. It was pretty comical.
Belting a 200rd box of API. Nasty Pelosi has nightmares about these high capacity magazines.
New, not rebuilt or remanufactured M2HB semi, Surefire Hellfighter, Mk93mod2 cradle, Mk123 aluminum tripod, UPA w/T&E (UPA and 200rd fixtures not shown). Acog 6x and KAC 3 rail mount. The IZLID 200p belongs to a buddy. Needs a modified mount for adapting to night vision/thermal and a flash suppressor would be nice for that too. May put an EoTech on top of the Acog one day, it's the only sub$3000 reflex sight for one of these and would be handy. They say AR's are like lego rifles... So is the M2. If I had the tools, I'd be building and selling these. REALLY wish I'd hoarded a few kits back in the 90's when you could get these for $1000 minus the side plate, but i was young and dealing with cost and fallout of the 94 ban. Price on these just keeps going up and up and...
Even semi auto M2's are badass though. M2 fires so slow you can damn near fire bursts that fast in semi. All it is is just a big ass blowback handgun on a mount. Browning's ingenuity is obvious and it's about as simple as these type of weapons ever got --there's no wonder it's still in use today. I'd still like to design and build a grip assy. that uses rotors on the thumb levers to fire a five round burst per, but ATF actually gives a shit what you do to these so a letter would be ideal.
If bullets weren't so damn expensive I think a conversion to .416Barrett would be cool.
Are you limiting this question to shoulder fired stuff or can it be mounted? I have one that is tripod mounted but has a shoulder stock in 24mm with a bore of .973". Land diameter is about .943". It was used as an anti-tank rifle in WWII. Its in the first pic.
The other is just 20mm or .787" land and .815" groove. Its shoulder fired and was also an anti-tank rifle. We've run it at some machinegun shoots out west and hit steel out to 1000yds and larger targets out to about 1850 yds. Its a Solothurn S18-1000 built in 1941 and its great fun to shoot. About 625gr of powder for a 1500 gr slug at around 2900-3000 fps. 3rd and 4th pics
The ammo pic shows an original armor piercing 20 X 138B round, projectile weight 2300gr, A new loaded round using a 1530gr 20mm vulcan training/practice projectile, a 50 BMG AP round and an 8mm Mauser rifle cartridge.
Frank
Have you seen the videos on Amazon Prime about these? Search for "Ian McCollum" and all his stuff should come up. He has one where he looks at these AT rifles. I think you'd really like it. He has one with the M2 on it and I can't remember which one. But he has HOURS of these films on Amazon on all sorts of shit, just have to look.