Handl Defense – FN SCAR 17 Lower for quicker reloads prone

This is most likely not a product for everyone, but if you own an FN SCAR 17 and do a lot of prone shooting this is definitely for you.

The Mk17-M110 SSR trigger module is a lower designed to aid in quicker reloads in the prone position.

Handl Defense describes the new lower as follows:

Handl Defense introduces the Mk. 17 – M110 SSR Trigger Module. This SR-25 / M110 magazine alloy trigger module is compatible with the FN SCAR® 17S, Mk.17, and Mk.20 platforms. The Mk.17 M110 SSR features a 45 degree left side beveled magazine well. This unique feature allows the shooter to track targets while changing magazines from the prone position.

During Handl Defense’s product development, multiple Snipers with Special Operations combat experience were consulted. It was found that reloading a semi auto sniper system often requires the shooter to break sight alignment with their target. That the ability to track targets while reloading was a specific capability gap.

The Mk. 17 – M110 SSR Trigger Module is redesigned so that a shooter can now engage, track, reload, and engage targets without ever taking their eyes off target. This saves valuable time and allows the shooter to maintain a higher level of situational awareness in high stress environments. The left side cutout magazine well allows for standard 20 round M110 type magazines to be reloaded easily.

The Mk. 17 – M110 SSR is made from billet 7075-T6 aluminum. We have completely re-engineered the trigger module. It accepts SR 25 / M110 pattern magazines, yet maintains the basic profile of the FN SCAR® trigger module. The Mk. 17 – M110 Trigger Module was designed to work with industry standard modifications such as after market triggers and other accessories.

We have specifically designed the magazine-well to be compatible with the combat proven SR-25 and M110 pattern magazines. We redesigned the grip tang to accept various AR series compatible grips without beaver tails, with the exception of Magpul MOE + and ERGO grips. Additionally, we re-contoured the arch above the grip to accommodate gloved and smaller hands, allowing easier access to the fire controls.

The Handl Defense Mk.17 – M110 was tested extensively prior to its release. It was tested in excess of the standards for the CAR-H (Mk.17 and Mk.20) Spec Sheet of September 2011. The Mk.17 – M110 Trigger Module is made of 7075-T6 aluminum in order to exceed the expectations for durability and reliability for the MIL-STD testing.

Below: Note the cut and curved magwell.



Utilization of proven and durable magazine systems

7075-T6 aluminum

No magazine-well flex or receiver flex

Reduces risk of trigger doubling

Readily accepts after market trigger sets

User-friendly ergonomics

Compatible with most AR-15 pistol grips

Drilled & Tapped grip screw hole

Factory FN SCAR® lower parts DO NOT require any modification for installation

Cutaway magazine well for 60% faster magazine re-loads from the prone


Material:  CNC Machined 7075-T6 Aluminum

Finish:  Black Type III Hard Coat Anodizing for both black and FDE trigger module

Magazine:  Lancer L7, SR-25, M110, MAGPUL .308 PMAG, ASC, POF, DPMS Magazines, etc.

Grip:  Most AR-15 compatible grips

Weight:  10 oz.

All steps and processes in the manufacturing of the Mk17 series trigger modules receiver is in accordance with US Military standards.”


Below:  A video showing the difference between stock and the new lower.

If you’re interested in upgrading your SCAR, please have 350 USD prepared and check out Handl Defense’s homepage.

Eric B

Ex-Arctic Ranger. Competitive practical shooter and hunter with an European focus. Always ready to increase my collection of modern semi-automatic firearms, optics and sound suppressors. Owning the night would be nice too.


  • A bearded being from beyond ti

    Were are you from Erik?

    • randomswede

      If my memory serves me he’s a fellow Swede. (Should I do the “different from Switzerland” joke here, I never know…)

      • A bearded being from beyond ti


  • JustAHologram

    Interesting idea

  • alex waits

    Is this a sign that the SCAR will be the new tactical Barbie ala AR15?
    Everyone and their mother making SCAR parts so you can mix and match and build one in your garage? 80% SCAR lower? Wouldn’t that be something.

    • Mike M

      Isn’t the upper on the scar serialized not the lower like ARs

      • Drew Coleman


    • Sunshine_Shooter

      Considering that a SCAR costs 2 grand, no. It will never be the new tactical barbie for the masses.

      • noob

        I’m wondering what will happen when the patents expire and any company just can build complete rifles and compatible parts.

        having said that, somebody ought to release creative commons licensed plans for a modern traditionally manufactured firearm which addresses the perceived shortcomings of the AR platform that weapons like the SCAR and HK416 were designed to remedy.

        Bonus points if this open source gun is compatible with, but not dependent on, many accessories and parts from the AR15 ecosystem.

        That would make the new design into a $600 tactical barbie without requiring high volume production. Just a couple of guys and a ghost gunner mill could get started.

  • AC97

    It kind of reminds me of the FAL’s magwell.

    • Anonymoose

      That, and those fancy AK magwells.

      • Robert Harper

        Well, there are adapters to put the most common SCAR stock replacement on the FAL, there have been at least 2 different people who’ve made and sold ACR stock adapters. The para FAL stocks aren’t that comfortable and they can be hard to get a good sight picture when using an optic. https://uploads.disquscdn.com/images/fa9a8d2b9efd58f94ef46273a5bc6fd55fa53cdec7a36e3d562b1f51af2efcdf.jpg

      • noob

        interesting – so a magwell speeds you up when standing/kneeling and slows you down while prone.

        I wonder if there is another system we haven’t considered yet which is fast both ways?

    • MarcoPolo

      Thought exactly the same thing. Wonder if the FAL’s were shaped like that for the same reason.

      • randomswede

        To aid magazine changes (for 90% of the shooters), yes; specifically in prone, probably no.
        I offer no proof, just an opinion.

        • Robert Harper

          I don’t know if that’s why Saive designed it that way but it does work that way when I reload my FALs.

          • randomswede

            From their homepage: “The Mk.17 M110 SSR features a 45 degree left side beveled magazine well. This unique feature allows the shooter to track targets while changing magazines from the prone position.”

            What I was trying to express was that the FAL was (I believe) designed to improve any reloads and that Handl Defense most likely were trying to avoid sounding like “a solution looking for a problem” and thus stressed the prone reloads as that is where the problems of 30 round magazines in an AR-10/15 style magwell are most obvious.

  • Dickie

    Why is the upper serialized

    • Anonymoose

      So you can swap barrels and lowers and change from .308 to 5.56. Unfortunately the SCAR-L does not have the ability to go up to longer cartridges, but you can change it to other AR15 calibers like .300 Blackout and 6.8SPC. I’m not sure the SCAR-L is long enough to work with an AK mag lower, but Handl makes a lower for the SCAR-H that takes AK mags.

    • Christian Hedegaard-Schou

      It’s an anachronism between classic US gun controls and classic EU gun controls.

      In the US, typically the part with the fire control group becomes the regulated part, the receiver. This is not law, but is the recommended way by ATF opinion and so that’s what we’re used to.

      However, in the EU, most controls are around bolts and barrels, so many EU-derived guns like the SCAR, HK’s, FAL, Sig, etc serialize the part of the gun where the barrel is mounted. So with guns that have a typically lower and upper receiver like the above, the “upper” becomes the controlled part.

      On the SCAR, since the barrel and bolt are part of the upper receiver group, it’s the upper that becomes the controlled item.

      If that firearm had been designed and manufactured in the US by an entirely US manufacturer, you would likely see the lower as the serialized part.

      Then there’s the Russians with their wacky “serialize the barrel trunion” crazyness.

  • SP mclaughlin

    Guess it wouldn’t work for lefties?

  • James F.

    Its interesting, the cut away design reminds me of the left side cut on the Accuracy International AICS AX chassis and AX rifles.

  • Jim N Jenna SK

    Yea, only if it works. I was around when handl first came out…

    • i1365868

      So was I, and what I saw were a bunch of shills on FNForum talking trash about Handl products with no evidence to back it up. Maybe it had something to do with Stryker Enterprises (a competitor that ripped off Handl’s design) being a payed sponsor of the forum. If you’ve never actually used a Handl product, at least consider the possibility that you’ve been lied to.

      • Jim N Jenna SK

        I have used one of the lowers and it worked as advertised. But this was well after all of the bad lowers went out. Don’t really like Stryker from his posts alone so not trying to say one is better than the other. The logo on the side of his lower is so gross. I passed.

        • i1365868

          I’ve never used either and don’t plan to any time soon. Stock does the job well enough for my purposes, but that’s because I have no other guns that use SR-25 pattern magazines so no real advantage (although this new magwell looks potentially useful).

          I just find it suspicious that Stryker announced their lower with nothing but CGI renders and afaik nothing concrete. Coincedentally not long after Handl lowers began shipping Stryker finally started making progress, as if they were waiting for something…

  • Harambe

    The video at the end proves that you can save 2 seconds by using the bolt release button instead of manually racking the charging handle.

  • Charles Brown

    No thanks. This company puts out crap and waits for people to tell them what’s bad and then tries to fix it. Being a member of the SCAR Owners Group and seeing way too many complaints about poor quality I’ll stick with the plastic FN lower and be happy.