Is Serbia the First Nation to Adopt the 6.5mm Grendel?

Nathaniel F
by Nathaniel F

The 6.5 Grendel is in many military small arms enthusiasts’ eyes the ideal military caliber, in theory combining the best characteristics of both 7.62mm and 5.56mm rounds. However, in the thirteen years since the round’s introduction, it has found little if any traction with actual military users – until now. It seems that the Serbian government has quietly adopted the “slow and steady” six five earlier this summer. From Novosti Online:

SPECIJALCI Serbian Army will be next year armed with the new US NATO modular rifles 5.56 and 6.5 millimeters. Procurement procedures and necessary tests should be completed by March next year, when the new weapons in the hands of the military and counterterrorist protivdiverzanata Special Brigade.

Purchase of new rifles, as explained in this unit, the continuation of the process of equipping with modern armaments, which began in 2008. Purchase of modern military equipment is the result of mounting tensions in the world and the intentions of the state leadership to prepare a response to the security threats

Additional clarification from Mondo:

During the shooting are tested modernized automatic rifle 7.62 mm and 5.56 mm, a new type of automatic sniper rifles and machine guns 6,5 mm “Grendel” modernized sniper rifles 7.62 mm “Lapua” guns and modernized. The new and modernized weapons from the “Zastava arms” is equipped with the new generation of optical and electronic sighting system produced in “Teleoptik gyroscopes”, “sensor INFIZ” and “Sova”, while a new generation of ammunition for the weapons produced Uzice Prvi Partizan

It must be noted that this is not a nation-wide adoption of the round, rather adoption by the Serbian Special Brigade only, and only in a limited role for sniper/designated marksman rifles. Still, this is a very significant victory for 6.5 Grendel proponents everywhere, and it also introduces the possibility of real battlefield data on the squat, short 6.5 round, where previously no data was available.

The 6.5 Grendel is an intermediate cartridge designed for AR-15-length rifles, requiring a change of bolt, barrel, and magazine. In exchange it provides greatly increased retained energy at long range vs. the 5.56mm, and at extreme ranges (over 900m), it even exceeds the 7.62 NATO in this respect. Thanks to its 11.3mm case head and rim dimensions, which it shares with the 7.62x39mm Soviet round, the 6.5 Grendel has made a natural partner for the AK family of rifles, and it seems to be Zastava-made AK pattern weapons in this caliber that have been adopted by the Special Brigade (article texts reference “modular American rifles”, but photos all show Zastavas). Serbian ammunition manufacturer Prvi Partizan will reportedly be the supplier for 6.5mm ammunition, which it is rumored is made to a slightly different specification than SAAMI-standard 6.5 Grendel.

Nathaniel F
Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. He can be reached via email at

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  • Glenn cheney Glenn cheney on Oct 05, 2016

    Apologies to the Board, I try my best to stifle my First A., I'm here for augmenting my Second A, I confess, I go in fear of Fourth A.
    Lot's of expertise here in this forum, well above my pay grade. N knows I'm all in on Grendel 6.5. I'm also aware the 6.5 doesn't embellish it's self to all, even N, but it is what it is and I am mindful about what they say about "my" opinions, lol. (I can fill that job description easily with no ASSistance! Me.)
    Having said that, I'm accumulating the components to complete a 6.5 Grendel, I call em' Meanie Greenies. We needed more T.B. for DRT. (Pilot hopefully state wide feral pest program for agriculture. (Hogs are eating you strawberries up.) These are not bench tools, these are "working hands" but they will look pretty.
    Yea, Se, Habla 7.62/.308. Miss Recoil's kisses from 6.5 sweeter, but we've kissed "ugly" before, just didn't want to be seen "out" with her....I digress, lol.
    Anyway, my tools will be sporting your featured article on ADK's triggers. Yea, they are tweaked to EAT ANYTHING IT'S FED.
    I've come though the Alexander flack, made it past Type I, II bolts, metallurgy, check, 9310,
    When 6.5 Creedmore ammo gets reasonable, I'll hang a barrel on whatever is laying around. I want to own what animals I can feed, or find food for, cheap.
    Thank you Uncle Vladimire for 26 cent 6.5 WPA.
    This has been an adventure. I have some mil-contract/spec experience, I can read, trying to do it right the first time. So far, shooting stix go back to Natchez for bi-pods, stix lacked stability.
    I don't know why, but my copy of these articles always come 5 days after you guys have worked the heavy bag out, then I come in the back door and it's like "What?" as I get the stare.
    N, I been the bearer of news more than I care to be, but be advised, there will be more 6.5 "adoption" papers being signed by as yet disclosed "parents."

    Thanks guys for sharing the expertise.

  • Core Core on Oct 05, 2016

    I would jump into the AK family for the 6.5, it's a great cartridge. Never had a need for 7.62x39 versus 5.56. I would prefer a modern SVD but you can't get them last I checked, maybe Kalashnikov USA will offer the SVD down the road.. The old SKS has higher muzzle energy than the AK so I never had a need. To me I would like an AK auto but might as well use SKS for semi auto. Used 7.62x39 hunting, not hugely impressed with down range performance versus 5.56.