Looking at millitaries around the world that have a "marksman" role and their Marksman rifles, only at regular armies and excluding special forces. My understanding of Marksman or designated marksman is soldier that received specialised marksmanship training who still operates in the capacity of a squad. While this relates to my reply, I will focus mainly on the rifles, not the roles because it seems like the in I&A rifles are limited by role but not vice versa.
US - DM: 7.62 NATO(M110) 5.56 NATO as well (SAM-R) vs Sniper: 7.62 NATO (M40, M110) .300 Win Mag (M2010) .50 BMG (M107)
AUS - DM: 7.62 NATO (SR 25, HK417) vs Sniper: 7.62 NATO (SR98) .338 Lapua (Blaser Tactical 2) .50BMG (AW50)
UK - DM: 7.62 NATO (L129, HK417) vs Sniper: 7.62 NATO (L118), .338 Lapua (L115) up to .50 BMG
Germany - DM: 7.62 NATO (MR308, G3) vs Sniper: .300 Winmag (G22).338 Lapua (RS9) .50BMG (G82)
Austria - 5.56 NATO (AUG HBAR-T) vs Sniper: 7.62 NATO (SSG 69) .338 Lapua (SSG 08)
Canada - 5.56 NATO (C7/8CT) vs Sniper : 7.62 NATO (C3A1) .338 Lapua (C14) .50BMG (C15)
France - 5.56 NATO (FAMAS G2) vs Sniper: 7/62 NATO (PGM Ultima Ratio, FRF2) .50BMG (PGM Hécate II)
Israel - 7.62 NATO (SR25, Galatz) 5.56 NATO (STAR-21) vs Sniper: 7.62 NATO (M24) .338 Lapua (Barak) .50BMG (M82)
Switzerland - 7.62NATO (Sig 550) Sniper: .338 Lapua (Sako TRG) .50BMG (PGM Hécate II)
These are just listing the countries off the top of my head, I think I'll stop here and really hope you see my point and the common theme here.
Looking at the Cyrus, the real life counter parts is the SVDK, chambered for 9.3×64mm taken from http://modernfirearms.net/sniper/sniper-rifles/rus/svdk-e.html. I think if you read this page you will come to the conclusion that this is not intended as a DMR. I am not sure where you take your classifications from.
As for Noreen Bad news it's not adopted by any armed force in the world, but looking at the caliber, you would assume it would not be utilised for DM purposes
I do agree that a sniper is a role that is ISTAR specific, taking out commanders, AT, AA, JTACs. But why am I limited to .408 and 12.7mm rifles? Can I not do that with a .338 or even 7.62 rifle? I like the option to be able to have a silenced weapon. I am glad you see the issue I am raising here, but if we have rules for CAS/UAV not do deal with everything in the AO and mortars and static weapons limited to FSG, why do we not try and control who engages long range targets and who engages short range targets to make if more fun for everyone?
I won't go too much into why I think some guns shouldn't be classed as "DMRs" and why shouldn't only the M320 and the Lynx be classed a "sniper rifle", but to break it down Barney style:
1. Snipers and Designated Marksmen should not be limited to rifles and calibres, but DMR and sniper roles do overlap, as DMR is meant to fill the gap between Riflemen and snipers.
2. A common trait of marksman rifles are that they are usually modified standard issue infantry rifles, they share ammunition already in use with other infantry rifles.
3. DMs stick with squads, Snipers team up with spotters, but I guess that involves teamwork.... whoops
Typing this reply up and researching weapons as examples has taken up all my evening, I hope you take this into serious consideration. As currently I do not see this situation as " pretty balanced".
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