There are a significant number of different large calibre anti-materiel rifles in use in Ukraine. One of the largest is the Monomakh, a 14.5×114mm semi-automatic, box magazine-fed anti-materiel rifle from the Ukrainian company Snipex. Snipex is a subsidiary of the XADO Chemical Group.
Snipex are well known for their series of precision anti-materiel rifles which includes the M100, T-Rex and Alligator. The Monomakh, introduced in 2021, is the company’s first semi-automatic rifle. It is recoil operated and feeds from a 5-round box magazine. It has a barrel 1,200mm [47.2in] long and an overall length of 2,050mm [6.7 feet], Snipex list its weight without a magazine as 25kg [55lbs]. The rifle has a listed muzzle velocity of 950 to 980 m/s and an effective range of just under 2,000 metres [1.2 miles]. The weapon is fired from a bipod with a monopod supporting the butt of the rifle. It’s key feature is its reciprocating barrel which helps soak up the recoil from the 14.5mm cartridge.

The Monomakh appears in imagery from Ukraine fairly infrequently, the earliest sighting of one of the rifles I could find was a photograph posted by a GUR member in late April 2022. Subsequently a number of videos of the weapon being fired at ranges by Ukrainian combatants was published in the Summer of 2022. The first posted on 7 August, shows a magazine being loaded into the rifle and the weapon chambering a round. Later that month a short video of a Monomakh firing at a range was published.

The earliest photograph of one of the guns I could find in 2023 was shared by a Ukrainian combatant in mid-July. Several months later, in September 2023, another Ukrainian combatant shared a photograph of himself holding up a Monomakh at a range. The same combatant also shared a short clip of himself firing the rifle, again at the range. In the clip he appears to be firing the rifle without sights or an optic. He is also seen helping the bolt into battery after each shot, the bushing which guides the barrel as it recoils into the receiver appears to have come loose. The rifles are typically paired with substantial optics, Snipex offer two of their own 6–24×56 scopes, the Jove 50 and the Galaxy G50. In late October, a female sniper with the 3rd Shock Brigade, posted several photographs and a video of herself firing a Monomakh from a position inside a building.

The large size and hefty weight of the Monomakh limits it applications somewhat but the 14.5mm round is useful against light armoured vehicles, buildings and field fortifications – the main limitation is getting it in, and out, of position to engage targets. There are videos of it taking two men to move the similarly heavy T-Rex and Alligator rifles. From the limited sample of imagery of the Monomakh in theatre it is difficult to gauge how widespread its use actually is. The simpler to manufacture bolt action Snipex rifles are seen more frequently.
My thanks to Cloooud and AbraxasSpa for help sourcing some of the imagery used in this article/video.
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