Adcor Defense MSR Polymer “Dust-Wipe” BCG

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Adcor Defense has been teasing on their Facebook page their “Dust-Wiper” polymer bolt carrier group. Originally introduced in their BEAR rifles, the polymer cover assists with “wiping” dust and debris from the bolt carrier during cycling after the dust cover itself has been released.

Their Facebook page has teased pre-orders, but the website does not currently have the cover or any pricing listed. Adcor has stated that they will be releasing complete bolt carrier groups and just the carrier.

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Hit up their Facebook page for a chance to win the first cover off the production line.

Click the photo to be taken to their page.

Click the photo to be taken to their page.



Nathan S.

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

Nathan can be reached at Nathan.S@TheFirearmBlog.com

The above post is my opinion and does not reflect the views of any company or organization.


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  • Drew Coleman

    What? How in the world does that work?

  • Esh325

    It’s just hilarious to me how gun manufacturers release all these products to people in the sporting market who will NEVER EVER see a practical use for and people buy it. Even police won’t see a use for it. With regards to military use, can they prove that over the original AR15 that it does significantly increase protection against dust and other debris that could jam a rifle?

  • Esh325

    I would say tests like that really mean very little at the end of the day. They aren’t scientific and don’t resemble the extensive tests organizations put there guns through when choosing a rifle.

    • CommonSense23

      And the extensive test are often a joke into themselves. Look at the SOCOM adoption of the Surefire suppressor over the KAC can. The Surefire Can is absolutely garbage. The SCAR program? Any test of M4 reliability that doesn’t use PMAGs or a equivalent. The adoption of the M14 over the FN Fal. The M9 trials.

    • Joshua

      You do realize who Mike Pannone is right? He was Marine Recon, Army SF, and SFOD-D, then he was a top instructor for the Army AWG.

      He would know these things.

      Also Colt fiddled with a dust wiper similar to this and found it to actually hinder performance.

      • Esh325

        Anybody can pour sand on a gun.

        • Joshua

          You are correct, but generally there is a difference when bubba beer gut does it vs someone like Mike.

  • tazman66gt

    A what wiper??? Butt wiper???

  • Sam Schifo

    You can do that with any decent quality mil spec AR and it will perform the exact same way.

  • Joshua

    Yeah and it beat itself to death when tested by the Military.

    • Esh325

      Where did you hear that?

      • Joshua

        Ok let me try this reply again.

        I saw how horribly the ADCOR rifles work first hand with a guy assigned to a NG unit brought over a 10″ upper to replace his M4 upper. It was one of the most finicky and worse performing uppers I have ever seen(but he looked like a bad ass with it so he kept it).

        It also did poorly in the IC. There is a reason no other op rod ar manufacturers use standard carrier key screws to mount a op rod strike plate or op rod(in the case of the PWS).

        To top it all off they went with a SCAR type tappit system that has proven through all the SCAR variants to be a more abusive type of operating system, you then add in the fact that the BCG on the AR does not have steel guide rails to keep it from tilting and you just have a poor design.

        • Esh325

          That’s mostly anecdotal evidence. There isn’t any released information about how the rifle performed. And the thing about the SCAR being an abusive type of operating is just conjecture really. I’ve never heard anybody say what you’re saying about the SCAR’s operating system.

          • CommonSense23

            The MK17 is well known for destroying quality optics. They absolutely crushed our EO Techs and Doctor sites. Even destroyed a couple Elcans which I thought was almost impossible.

          • Then why do they break optics and night vision tubes?
            My friend develops tubes for a living and an accelerometer that his firm constructed showed that the recoil impulse of the scar was ludicrously higher than its competition.

          • Esh325

            I haven’t seen any of these broken optics and night vision tubes from SCARS.

          • Joshua

            SOCOM saw an astounding amount.

          • Esh325

            What SOCOM report mentions it?

          • Joshua

            None that are Dist A.

          • CommonSense23

            How many Scars have you dealt with?

          • Esh325

            None, but I haven’t ever seen this being reported as a problem with any of the literature I’ve read regarding the SCAR. If the rifle had problems with destroying optics, I’m sure it would be pretty well known .

          • CommonSense23

            And it is a pretty well known problem with the SCAR Platform. I have a good amount of experience with the SCAR platform. Been in charge of around 180-200 MK17s, and 50 MK20s. It has been the most troubled weapons systems I have dealt with. And I have had a lot of experience with pretty much all the small arms in the current inventory. The SCAR family has been hard on optics, with large issues of quality control, and probably the most flawed acquisition program in the last 50 years. The 17s have improved to the point that they are no longer horrible, but they are average guns at best.

          • Esh325

            “Pretty well known” Yet it’s actually the first time I’ve heard anything like that. I’m sorry, but it’s not a substitute. If you can find me any links of these organizations talking about the SCAR being hard on optics, then I will take it, until then it’s just anecdotal evidence on a gun message board.

          • Esh325

            It can’t be more flawed than the M16’s acquisitions where it was widely issued to soldiers when it didn’t work properly and cost soldier’s lives. You’re telling me the SCAR is more flawed than that? That’s just bogus I’m sorry.

          • CommonSense23

            Absolutely worse without a doubt. See the AR-15 had extensive use with SOF forces with extremely favorable reviews before the M16 was used. The SCAR program rejected pretty much all user feedback about the weapon. The SCAR was rejected outright by NSWDG whose job is to T&E equipment. The M-16s initially fielded were given to a force with no training, using the wrong ammo specs. The SCAR was delivered as it was designed and ran into large issues when fielded with SOCOM. Why do you think it was dumped in the MK16 version so quick by the Batts. The M16s were far superior than the M14 they replaced. The SCAR was not even close to the HK. The major reason the 417 was not adopted was HK could not supply SOCOM within there timeline requested. FN could. Add to that one of the guys most responsible for its adoption in NSW and arguably all of SOCOM retired and went straight to FN.

          • Michael R. Zupcak

            The Scar 16, right? I’ve read that the Scar 17 has a really nice recoil for a 7.62×51.

          • CommonSense23

            It’s the 7.62 version.

        • Mack

          Adcor has since changed there whole carrier, it is now enlarged at the buffer end and is a one piece carrier, my rifle is bullet proof, granted i have maybe only fired 7k rounds through it (the last grand or so mostly in full auto, just got my 07/02 and having fun!!!!) so i wouldn’t say its military tested, but it is one solid rifle and they have some of the best customer service in the game.

  • Phillip Cooper

    Seems to me this would de-tune the entire operation of the rifle. The mass of the BCG is integral to control recoil of the BCG into the recoil spring, and thus the cycling of the rifle.
    In other words, “solution to a problem no one is having”

  • Giolli Joker

    HE IS BACK!!!!!! Good news!

  • CommonSense23

    I honestly don’t know. I have been issued both the Surefire and KAC and the KAC can crushes the Surefire in every way possible. It’s noticeably quieter and runs much cooler. With the Surefire we were getting mirage that completely obscured the target within two mags at a average rate of fire. There have been a couple cases of Eo Techs being destroyed from the cans retaining so much heat that went to the chamber. They will turn red from any sustained high semi auto fire. We tried using silicone suppressor covers and hose clamps, but they ended up catching on fire. And multiple individuals have received burns doing transistion drills with them. They are absolutely trash.

    • Joshua

      I think those results are still classified.

      • CommonSense23

        You got any experience with the Surefire Cans.

        • Joshua

          Not a lot, all my time was spent with the KAC NT4 suppressor.

          • CommonSense23

            You running a mk18 MOD 0 or 1?

  • Mack

    This isn’t really a wiper, i don’t know why they call it that. I call it more of a dust cover for when my dust cover is open! it seals up the chamber completely even when the dust cover is flipped open. For civilians probably not much of a use, for military, i could see it useful when sand is blowing. doesn’t hurt having one more line of defense that doesn’t sacrifice anything.

    • Couch Ninja

      Very well said Mack. Couldn’t have explained it better.

  • Joshua

    Out of habit I just lump all variants together and refer to them as the SCAR. I really should be more specific.

  • CommonSense23

    I won’t call the MK17 a POS anymore. I will give it that. I will call the MK20 a absolute abortion of a gun. The 17 has got noticeably better since it was fielded. It’s still not a good gun. It’s about average. My problem stems not from the fact the gun was in its infancy, but the fact it was completely outclassed by a lot of proven weapons already on the market and some being used real world. The AR-15 has had huge strives in performance the last 50 years, but when first fielded it was still far ahead of the competition to begin with. The SCAR wasn’t. It was a gun pushed into service and it caused the loss of two excellent weapons platforms, the MK11 and 12.

  • Couch Ninja

    OK, take your word for it. NG boy broke multiple DoD and US Army regulations but what ever. I don’t agree about the ADCOR being crap. I have two, 16″ & 18″ both piston, they are the best, most reliable, deadly accurate AR’s I have owned. I also have two LaRue Tactical OBRs, 18″ 762 and 16″ 5.56. Also, bad ass rifles. The ADCORs are as solid as my LT AR’s. I have no idea what you are basing your comments are? Articles in Army Times and AUSA magazine sighted the ADCOR and the FN as the odds on favorite, leading the pack in the IC. Maybe you want to read this independent evaluation by one of the worlds firearms testing facility Go to the ADCOR website and look at the H.P. White Labs testing report.

    • Joshua

      So you don’t believe me, even when I posted actual photographic evidence?

      I’m done here then, because no matter what anyone says or shows you your head will still be in the sand.

      Just fyi, Amy Times is in no way affiliated with the Army. It is run by an individual and generally wrong on most things they write.

      Also H.P. White said the Relia-Bolt was the most reliable bolt they have ever tested.

      I would be interested to know what environments and firing schedules your ADCOR rifles have seen.

      • Couch Ninja

        Relax. Didn’t say I didn’t believe you. I have seen this picture. My issue is how did he get it in country? were you in his unit?

        Funny how you mentions “Head in the Sand”.

        I own the rifle you are bagging and claim to know so much about. I have more than 10k rounds through both. Your experience with the rifle is you once saw some National Guard guy with one. And some articles you read. But I own, not one, but two of these and you discount my opinion. Who’s head is in the sand Bro?

        Clearly your the smartest guy in the room where ever you go.

        I’m out of this one.

  • Couch Ninja

    ADCOR is posting that the first 100 Bolt Carriers with the polymer piece goes on sale for a $100 bucks at noon, est East Coast time.