# Anzio 20mm rifle
The Anzio 20mm rifle is an American bolt-action [anti-materiel rifle](https://www.edgepedia.org/anti-materiel-rifle) built by Anzio Ironworks Corporation of St. Petersburg, Florida, and chambered chiefly for the 20×102mm Vulcan autocannon cartridge.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) The company's owner, Mike Remo, a veteran builder of bolt-action .50 BMG rifles, developed it to extend the maximum effective range available to a rifle, and the weapon is sold to civilian, law enforcement, and export customers.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) • [2](https://guns.fandom.com/wiki/Anzio_20mm_rifle) At 6 feet 8 inches long and 59 to 130 pounds depending on configuration, it is far larger than the .50-caliber [Barrett M82](https://www.edgepedia.org/barrett-m82) that dominates the anti-materiel rifle market.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) • [3](https://www.militaryfactory.com/smallarms/detail.php?smallarms_id=418)
| Key fact | Detail |
|---|---|
| Type | Bolt-action anti-materiel rifle, magazine-fed from a detachable 3-round box magazine; single-shot and take-down versions also offered[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) |
| Cartridges | 20×102mm Vulcan (percussion primed), 14.5×114mm, and the Anzio 20-50, a 20mm case necked down to .50 caliber[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) • [4](https://bluebookofgunvalues.com/products/anzio-ironworks-corp-rifles-bolt-action-mag-fed-rifle) |
| Ballistics | 1,543-grain projectile at 3,396 ft/s, about 39,500 ft·lbf of muzzle energy[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) |
| Dimensions | 6 ft 8 in long without suppressor; 49-inch fluted match barrel; 59 to 130 lb depending on mount[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) |
| Range | 5,000 yards maximum range per the manufacturer; a typical 20mm anti-materiel rifle is credited with about 2,000 m effective range[5](https://www.anzioironworks.com/MAG-FED-20MM-RIFLE.htm) • [6](https://www.smallarmssurvey.org/resource/anti-materiel-rifles-research-note-7) |
| Legal status | A destructive device under the US National Firearms Act, requiring a $200 ATF tax stamp; some 20mm explosive projectiles are themselves taxable destructive devices[7](https://www.atf.gov/files/publications/download/p/atf-p-5320-8/atf-p-5320-8.pdf?mobile-app=true&theme=wiki) |
| Price (2011) | $11,900 for the mag-fed rifle, $9,800 single shot, $13,000 with free-floated barrel; suppressor $3,200; training rounds $8 each, tracer $15[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) |
## Anti-materiel rifle context
Anti-materiel rifles are designed to engage and neutralize targets at distances well beyond a kilometer, using specialized ammunition to pierce light armor, and they are also used for anti-personnel purposes. Most are chambered for 12.7 mm (.50 caliber) ammunition, but some fire cartridges of up to 20 mm. The [Small Arms Survey](https://www.edgepedia.org/small-arms-survey), a Geneva-based research project on armed violence, notes that 12.7 mm and 14.5 mm rifles of this class have effective ranges of 1,000 to 2,000 m, and that a 20 mm anti-materiel rifle typically has an effective range of around 2,000 m.[6](https://www.smallarmssurvey.org/resource/anti-materiel-rifles-research-note-7) The class descends from the First World War anti-tank rifles, such as the 13 mm Mauser 'T' Gewehr of 1917, and was revived in 1982 with the Barrett M82.[6](https://www.smallarmssurvey.org/resource/anti-materiel-rifles-research-note-7)
Within that class the Anzio stands at the top of the caliber range. The Small Arms Survey's weapons identification guide lists Anzio Ironworks models as the sample anti-materiel rifle for the 20×102 mm cartridge, whose high-explosive projectile weighs about 101 g.[8](https://www.smallarmssurvey.org/sites/default/files/resources/A%20Guide%20to%20the%20Identification%20of%20Small%20Arms%20and%20Light%20Weapons%20%28WEB%29.pdf)
## Design
The rifle feeds from a detachable three-round box magazine into a tubular receiver. Standard features include a quick-change take-down barrel, a fluted and hand-lapped 49-inch match-grade barrel, an oversized high-efficiency clam-shell muzzle brake, four locking lugs on the bolt, a titanium firing pin, a heavy-duty bipod with a fully adjustable rear monopod, a 40-minute inclined scope rail, and a blue-printed bolt and action in a percussion-primed configuration. Optics are customer supplied, with a minimum magnification of 20x recommended.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) • [5](https://www.anzioironworks.com/MAG-FED-20MM-RIFLE.htm)
The muzzle brake does the work of making the cartridge shoulder-fireable. A Small Arms Review writer described the muzzle blast as something that has to be seen to be believed, noting a video in which the shooter's hair lifts completely up and his head kicks back a few inches; the same review suggested the rifle's weight makes it best moved by vehicle and possibly pintle-mounted on a trailer or scout car.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) A semi-automatic variant has been shown, but the bolt-action mag-fed rifle is the model in regular production.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) • [9](https://gunspec.io/en/firearms/anzio-ironworks-20mm)
## Cartridges
The predominant chambering is the 20×102mm Vulcan, a cartridge developed for aircraft autocannons. The [M61 Vulcan](https://www.edgepedia.org/m61-vulcan), a rotary Gatling-type cannon chambered for 20×102mm ammunition, has been standard armament on many United States combat aircraft, and the round is also fired by the M39 [revolver cannon](https://www.edgepedia.org/revolver-cannon).[10](https://www.awm.gov.au/collection/C1121067) • [9](https://gunspec.io/en/firearms/anzio-ironworks-20mm) Anzio converts the military ammunition to percussion priming for rifle use.[4](https://bluebookofgunvalues.com/products/anzio-ironworks-corp-rifles-bolt-action-mag-fed-rifle)
Two other chamberings are offered. The 14.5×114mm Soviet heavy machine gun cartridge is available, and a multi-caliber kit lets one rifle switch between 14.5 mm and 20 mm. The proprietary Anzio 20-50 necks the 20mm case down to .50 caliber and fires a 750 to 800 grain bullet at 3,200 to 3,600 ft/s; the same action in 20-50 caliber costs $1,400 less than the 20mm version.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/)
## Legal status and sales
Under the [National Firearms Act](https://www.edgepedia.org/national-firearms-act), any weapon with a bore diameter greater than one-half inch is a destructive device, so the Anzio 20mm requires ATF approval and a $200 tax stamp. The ATF handbook adds that some 20mm high-explosive and high-explosive incendiary projectiles contain more than one-quarter ounce of explosive or incendiary material and are themselves destructive devices, which is why explosive 20×102mm ammunition is not available to civilians without a $200 transfer tax and the proper form for each round.[7](https://www.atf.gov/files/publications/download/p/atf-p-5320-8/atf-p-5320-8.pdf?mobile-app=true&theme=wiki) • [1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/)
The [Federal Bureau of Investigation](https://www.edgepedia.org/federal-bureau-of-investigation) became a customer in 2009. A presolicitation notice, number 10-Q-LDQ002768 from the Quantico Contracts Unit, announced a non-competitive, sole-source award to Anzio Ironworks for two Magfed 20mm rifles with suppressors, extra magazines, and non-firing bolt assemblies, the justification being that only one responsible source could supply suppressed 20mm bolt-action rifles. Small Arms Review reported that FBI training at Quantico was underway and that the bureau valued the ability to engage a hardened target at a distance.[11](https://www.mdshooters.com/threads/unusual-fbi-firearm-purchase.28026/) • [1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/)
Civilian sales are small-scale but real. As of 2011 the mag-fed rifle listed at $11,900, the single-shot version at $9,800, and the free-floated barrel model at $13,000, with training rounds at $8 each and tracer at $15.[1](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/) Anzio Ironworks has specialized in large-bore bolt-action rifles and has made gun parts and accessories since 1994.[4](https://bluebookofgunvalues.com/products/anzio-ironworks-corp-rifles-bolt-action-mag-fed-rifle) The company bought a former wool and mohair warehouse in [Alpine, Texas](https://www.edgepedia.org/alpine-texas), in 2007 for its operations, alongside its [St. Petersburg, Florida](https://www.edgepedia.org/st-petersburg-florida) address.[12](https://downtowntx.org/documents/final/Property/808/1480980569BBWM-Building-History_Archives-of-the-Big-Bend.pdf)
## References
1. [Anzio Ironworks AMSD 20mm x102mm Anti-Material Rifle, Small Arms Review V14N6 (March 2011)](https://smallarmsreview.com/anzio-ironworks-amsd-20mm-x102mm-semiautomatic-anti-material-rifle/)
2. [Anzio 20mm rifle, Gun Wiki (Fandom)](https://guns.fandom.com/wiki/Anzio_20mm_rifle)
3. [Anzio Ironworks Corporation AIC Mag-Fed 20mm Anti-Materiel Rifle (AMR), Military Factory](https://www.militaryfactory.com/smallarms/detail.php?smallarms_id=418)
4. [Anzio Ironworks Mag-Fed Rifle, Blue Book of Gun Values](https://bluebookofgunvalues.com/products/anzio-ironworks-corp-rifles-bolt-action-mag-fed-rifle)
5. [MAG-FED 20MM RIFLE, Anzio Ironworks](https://www.anzioironworks.com/MAG-FED-20MM-RIFLE.htm)
6. [Anti-materiel Rifles, Research Note 7, Small Arms Survey (June 2011)](https://www.smallarmssurvey.org/resource/anti-materiel-rifles-research-note-7)
7. [ATF National Firearms Act Handbook](https://www.atf.gov/files/publications/download/p/atf-p-5320-8/atf-p-5320-8.pdf?mobile-app=true&theme=wiki)
8. [An Introductory Guide to the Identification of Small Arms, Light Weapons, and Associated Ammunition, Small Arms Survey](https://www.smallarmssurvey.org/sites/default/files/resources/A%20Guide%20to%20the%20Identification%20of%20Small%20Arms%20and%20Light%20Weapons%20%28WEB%29.pdf)
9. [Anzio Ironworks 20mm, GunSpec.io](https://gunspec.io/en/firearms/anzio-ironworks-20mm)
10. [20 mm M61 Dummy Cartridges, Australian War Memorial](https://www.awm.gov.au/collection/C1121067)
11. [Unusual FBI Firearm Purchase, Maryland Shooters Forum (quoting solicitation 10-Q-LDQ002768)](https://www.mdshooters.com/threads/unusual-fbi-firearm-purchase.28026/)
12. [Historic Building Survey, Big Bend Wool and Mohair Building, Archives of the Big Bend, Sul Ross State University](https://downtowntx.org/documents/final/Property/808/1480980569BBWM-Building-History_Archives-of-the-Big-Bend.pdf)
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*Topic: Encyclopedia › Technology and the built world › Engineering and manufacturing › Firearms and ammunition › Rifles and carbines › Sniper and anti-materiel rifles*
*Initially written Sep 17, 2026 · Reviewed: Sep 17, 2026; Sep 30, 2026; Oct 15, 2026 · Edited: Sep 30, 2026; Oct 15, 2026 · Last review: Oct 15, 2026*
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License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license