SR-25 EM Carbine History

Shortly after 9/11 elements operating in Afghanistan noted that the M4A1 even with our (KAC) MRE FF RAS, and S&B Short Dot was not up to the task of going from the CQB fight to the edge of the villages or out in the mountains, and while the 18" Mk12 Mod0 and Mod1 are capable in the accuracy department, that they where neither very handy for CQB, nor would 5.56mm, even with then newly adopted 77gr AA53 round (Mk262) capable of barrier penetration at range. Larry Vickers did a segment on Tactical Arms to air this year where he talks about why the M4 was picked over the MP-5 for CQB, as to somewhat paraphrase him “ you sometimes need to step out of the house and make a 100m or 200m shot”, he then relates to the 7.62mm SR-25 EM Carbine, and the 7.62 Battle Rifles, “well in Afghanistan, sometime you need to step out or go up on a building an make a 400-600m shot, and 5.56mm is not ideal for that”.

We had built pre-ban SR-25K 16" guns, and some other 7.62 carbines, however they where not really designed for the “M4 type” roles that where being envisioned.

We came up with the SR-25 14.5" Battle Rifle,

With the idea is that it was very similar in appearance to the M4’s and not going to draw undue attention, as well unlike the majority of systems, it used the same manual of Arms as the M4/M16, so soldier who have years on the M16FOW, don’t have issues relearning drills, especially valuable under stress.

7.62mm is more optimized in longer than 14.5” barrels and really wants at least a 16" barrel, and a lot of concerns about the reliability of the 14.5" gun were being given, so shortly after the 16" SR-25 Battle Rifle was developed, which was really just a longer barrel.

We had never envisioned a 7.62mm gun being run like an M4, and especially with a suppressor neither the 14.5 nor the 16" gun where at the reliability level that was desired.


Especially suppressed, I ran the 16" SR-25BR at classes, and demos.

Accuracy even with the chromed barrel was always good, sub-MOA and a fair amount under the 1/2MOA mark.

It is a good gun, but in high suppressed round counts it got dirty and finicky.

Near the first quarter of '09 we started work on a PIP of the 16" gun, as well as the 20” M110.

High-speed video, lots of rounds, more high-speed video, changes to the gas system, and more rounds and video, a lot more stuff and changes to the bolt carrier, the recoil system resulted in the SR-25 EM Carbine.

At the same time, the optical industry was busy working on a 1.1-8x scope to give the user the ability to take advantage of the added capabilities of the 7.62 round.


What we ended up with was in our opinion the finest 16" 7.62mm gas gun on the planet.

We shot several EM’s for over 1,000 rds fully suppressed with no additional lube, with no stoppages

We have done extensive lifecycle work on the guns, endurance testing etc.

We wanted to build the best gun we could, so if someone on a mountain top in Afghanistan or wherever else needed to have a gun that would go and go and go, it would.

If he has to dump it in snow to cool it down, it would go and go and go.

With well over 50,000 rounds thru it, including a day where Mr. Knight and I stood in a puddle of muddy water splashing the gun to cool, we feel we are there.

Unlike our previous carbines, which we showed at SHOT (I have a pic somewhere of me holding the 14.5" gun at SHOT’04 when I was still in the Canadian Army) and never really publicly released for sale, we wanted a short 7.62 like this this gun to be our Flagship.

So its here, and available.

It’s probably available elsewhere, but can you give the particulars of the carbine?

Rail? Gas length? Materials? Barrel twist? Barrel maker? Anodizing? Trigger/FCG? BUIS? Optic mount? Suppressor models directly compatible? Etc?

Thanks!

Sorry

Barrel is 1:11 twist Chromoly Steel Chrome Lined
Most barrels are Obermeyer, however Krieger and our own in house barrels are also being used.

Gas System - M16 Rifle Length

Rail - Rifle Length Black M110 URX, with Integral Front Sight

Anodizing - Black Milspec TypeIIIA HCA

Trigger - KAC 2 Stage Match

BIS - KAC 2-600m P/N 98474

Optic Mount - KAC 34MM

Suppressors compatability
KAC EM Carbine Suppressor (M110/Mk11 style)
Surefire 762K (with SF specific 762FH)
AAC 762-SD (with AAC specific FH)

Those are the only ones I am aware of longer term testing with.

Do standard M16 rifle length gas tubes work with it?

Dont think gas tube would ever be an issue, just wondering.

Again, great post thanks for the info. More pics of the earlier guns and prototypes would be cool too!

Kevin,

Was there a reason KAC opted against extended feed ramps in the EMC? Thanks.

I am going to get with III and make a better pictorial.

Yes a standard M16 gas tube will work, but I strongly beleive the barrel will be cooked long before the tube goes.

We did not see any issues with feeding - so ramps where not on the agenda, they may be brought in sometime in the future though.

The biggest improvements to this gun where on the extraction and ejection side of the house.

From what I’ve heard it actually can decrease accuracy by deforming the tip of the bullet. LMT however uses it in their 7.62 MRPs.

Great info on the SR25 Kevin. I want one!

As does LaRue in their OBR.

I agree that extended ramps do require a high degree of barrel extension to upper receiver fitting to avoid the “lip” that can catch bullet tips.

Love the write up! Good read.

Great information. I’m interested to know if you can expound on some of the upgrades that were made to increase hard-use reliability.

I was remiss in my earlier post for not thanking Kevin for the great info and photos of the EMC. So thank you!

One particular point that Kevin brings up is interesting to me: going from a building (presumably CQB/close-in fighting) to breaking a 400-500 yard shot outside.

This scenario presupposes the existence of a rifle system that is suitable for both CQB and the accurate, effective distance shot. It sounds like a 5.56 gun, while very effective in the CQB role, is marginally effective at a distance. And traditional .308 rifles, while very effective at a distance, are marginal for close-in, extended-fire situations (e.g. NSRs).

I have been shooting my EMC for awhile now, and overall have found the rifle very manageable with my go-to factory loads, which are Hornady 168gr TAP Amax. Follow-on shots, NSRs, and the like are fairly easy to do, provided you’re driving the gun aggressively and your stance and positioning are set up to mitigate what recoil is present. Of course, at 13lbs loaded (20rd Magpul mag, Elcan Specter DR, Surefire Scout light, VTAC sling), the EMC is not a lightweight anything, but the weight is in the same ballpark as a loaded M4 and requires about the same level of upper body and core strength.

So to the question at hand: are we seeing the emergence of a true do-all rifle that combines reasonable compactness and controllability for close-in work with the caliber and bullet selection for true gut-punching takedowns five, or even six, football fields away?

I have to admit, I’m mightily tempted to use my EMC in just this manner. And I’m picking up Internet chatter (FWIW) that SOCOM is fielding the Mk17 in larger-than-expected numbers because warfighters are hungry for the extra punch and barrier penetration characteristics of 7.62, as well as the long shot capability that comes with the bigger round.

Of course, it doesn’t hurt that .308 practice ammo is $0.39/round, vs $1/round for 6.8 or any of the alternative AR15 calibers that provide more punch than 5.56.

This is just my plan for my LMT. If I get it worked out to the point that I trust it, it will likely become my main go-to gun, and I’ll get more of them.

If you can disclose this information, what groups are going to be using this weapon system?

Fantastic read and a cool bit of history. Thank you. It’s on my list of must-haves, but for now my SR15 will have to do (and it does very well ;)).

Kevin, thank you for the great info in this post. I LOVE reading about KAC guns!!

ARKAR

Nice write-up. Thanks for posting it.

The finest…that could be a pretty good gun!

I’d like to hear how you tweaked the gas system, recoil system and bolt carrier. Did you maintain parts compatibility with AR-15s?

Well, I can still dream cant I???:stuck_out_tongue:

Very nice…love the pictures. I think I missed it, who is making the new 1.1-8 scope? Can’t really tell from the picture? Also, what is the preferred practice ammo and what kind of groups are you getting with it? Match ammo is not cheap:D. Thanks for the info.