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  1. #1
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    Ambi Side Charger--Initial Impressions

    It’s time to post up a few thoughts on the side charging upper I received as part of the T&E program. Since there are so many different parts involved I will go part by part and hopefully cover everything.

    This review is definitely ongoing so these are not final conclusions but rather initial impressions.

    What I received is an ambidextrous XSR-15 side charging upper from Crosshill Technology. The barrel is a heavy varmint mystery barrel of an unknown origin. It has no markings on it, not even a twist rate or the type of chamber. The hand guard is a Rainier Arms Sampson Evolution. A Syrac adjustable gas block came installed as did what appears to be a Smith Enterprises Vortex flash hider.

    The first thing I had to do when I received the upper was to remove my Seekins bolt catch/release and replace it with the proprietary one that came with the upper. It is important to note that this upper will not function normally with a standard bolt catch--which by default creates a compatibility issue if you plan to swap out standard uppers. Initially this was a major turn off.

    Fortunately my lower does not use roll pins so replacing the bolt catch wasn’t that big of a deal. It is by far not an impossible task but it leads me to believe that if you want this particular ambi side charger you will want a dedicated lower for it. It’s just my opinion but a bolt catch/release is not a part that is meant to be repeatedly taken off or put on.




    The machine work on the upper itself is quite good. I have a CMT Tactical billet set and the Crosshill fit and finish by comparison is really good. The machine work is great. Zero complaints about any of that except that it is heavy. One other interesting part about the construction is where the charging handle normally is there is a loosely threaded bolt that is flat on one side. If you want to remove the bolt carrier group, take the upper loose as normal, unscrew that bolt and the BCG will come right out (of course you have to also unscrew the charging handles to do this). The bolt is in there only finger tight at best so you can easily take it apart in the field.





    The way this upper functions changes some of the most basic functionality of a standard AR15. One of the unique things about the upper receiver is that it not only renders the charging handle obsolete it also renders your standard bolt catch button (mostly) obsolete, and for those who care, it also replaces the forward assist function. All of these factors make it pretty of interesting.

    How this upper receiver functions is simple: to charge the rifle just insert full mag, pull it back and let it rip. When your bolt is locked back you no longer have a button (to speak of) on the side of the rifle to release the bolt. A gentle tug on either of the charging handles and away she goes. It can be done in a split second and even with no hands if you want to. (Just bump the charging handle against something with a slight forward motion and it will release) One caveat to this is that if you want to close the bolt with an empty mag in place it quickly becomes a two handed ordeal. You must drop the empty mag, insert a loaded mag, or use two hands…one to pull the charger while pressing the rather small bolt release button. It can be a pain to close the bolt with an empty mag but it’s not a total deal breaker considering how easy the rest of it is to operate. The empty mag/closing the bolt thing seems to be the main quirk I’ve found.





    When I first shot the rifle having both sides of the upper open I was expecting a blast of gas in the face. To my surprise there was nothing--however I attribute that to the adjustable gas block. I still want to close off the gas block all the way and see what happens. My suspicion is that I might get a gas blowback but that it wouldn’t be anything unbearable. I for sure would think twice before I started shooting it with a suppressor though. Even the manufacturer does not recommend it.

    I have no experience with adjustable gas blocks but it appears this one had already been adjusted. The net result was that the gun seemed to be stroking kind of weird to some degree. It was blowing back far enough to eject brass and pick up another round, but not far enough back to lock the bolt back when the mag was empty. The brass was also being ejected in a different position than normal.



    My initial impression is that if I were to own an upper like this I would most definitely have a dedicated lower for it. Using the proprietary bolt catch isn’t such a big deal if you use the rifle as it was intended (and have a lower is dedicated for it). It does take some getting used to as well as learning its quirks. I think this upper would actually be ideal for shooters who may have some sort of impairment such as arthritis, carpel tunnel, or other things that may impair the normal use of an AR15. I am not a cop or a military person so I can’t speak from experience but based on my non professional opinion I would put this upper in the recreational category.

    Initially I thought that the ambi charger would be uncomfortable to carry. This concern is largely over blown. However depending on how you carry your rifle and how your sling is set up the charging handle can snag or poke you. If you carry bolt open it could be a problem. It all depends on how you carry and what you are wearing. If you had a plate carrier with forward mags for example I think it could get hung up whether its open or closed.

    A couple of quick other notes about the other parts. The hand guard---I love it. I absolutely love the feel of it. It’s very solid.





    The barrel is very interesting. I have yet to do any serious accuracy testing with it but my hunch is it has potential for very good accuracy and will handle heavy loads. On the other hand the thing is extremely heavy. I can pretty much guarantee that you won’t be lugging that thing around too much. I guess that type of barrel is mainly used for hunting or gopher shooting or possibly some serious target shooting. Honestly I am still learning the real intent behind having such a beefy barrel. I am not sure what the substantial extra weight is supposed to accomplish. I don't know if I am really going to take a month and try to develop an accuracy load and do extensive accuracy testing in my spare time, but suffice it to say I think as for accuracy the barrel has a lot of potential.

    The last part is about the flash hider. Supposedly these are great for what they are designed for but honestly I don’t do much shooting at night and I don’t really care about flash. That aside choosing a dedicated flash hider vs a muzzle brake—I really wonder why that is with this particular set up. I understand the flash hider is suppressor compatible but if you aren't shooting suppressed I might opt for something else.

    As for the muzzle device itself---it pings like a tuning fork. You can thump or bump it and it will ping. You can charge the rifle and it will ping. The pinging ringing sound basically gets annoying, but aside from that I don’t really have much of an opinion about it yet.






    Now here are some other various shots for you to look at and or ask questions. I encourage you guys to ask questions so that it will give me more to think about. I haven't had much time to really shoot it a whole lot to be honest but I do plan more shooting with it as opportunity presents itself.










  2. #2
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    Nice review brother.
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  3. #3
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    Nice write up, would be interested to see some groups.

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    Great report of your findings. I have always heard many say they preferred this particular model receiver because they did want it for suppressor use. The common thought being that the charging handle area being basically closed off would be better for those pesky gasses in the face. I didn't know they actually do not recommend suppressor use per the Manu.

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    Quote Originally Posted by GaSwamper View Post
    Great report of your findings. I have always heard many say they preferred this particular model receiver because they did want it for suppressor use. The common thought being that the charging handle area being basically closed off would be better for those pesky gasses in the face. I didn't know they actually do not recommend suppressor use per the Manu.
    Thanks!

    Here is a quote and a link to the FAQ on Crosshill's website. It's the second from the last FAQ near the bottom of the page.

    "I want to use a suppressor with my XSR-15 build, do you recommend one over the other?

    Yes, when using a suppressor, CrossHill Technologies recommends the Right Hand version. This is due to the gases that can escape from the left slot of the receiver."

    http://shop.crosshilltech.com/pages/faq

    (this particular model comes in ambi and right hand only)

    I would also say though that I think you could shoot this suppressed but an adjustable block would be pretty mandatory if you do. It would require some special tweaking but I think it could be done.

    Quote Originally Posted by velocity2006 View Post
    Nice write up, would be interested to see some groups.

    We just now got half way dug out from under that tornado... so hopefully I can get more shooting time with it pretty soon. I definitely want to adjust the gas block down and see what kind of results that produces. I will try to run some decent ammo and see what kind of a group I can get.

    That barrel is really a beast. It's thick and heavy!!! I would say the upper alone weighs almost twice as much as my regular upper. If I can find a scale I will tell you exactly. That barrel is stiff and heavy. I think it could shoot some nice groups myself, but I haven't run it through it's paces yet.

    Quote Originally Posted by GOST View Post
    Nice review brother.
    Thank you GOST!
    Last edited by alamo5000; 6 May 2015 at 20:34.

  6. #6
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    And please pardon the pics. They were meant to be informational not Uwone/Stickman/Dsully/etc etc etc etc etc etc etc etc gun porn

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    I forgot to mention, you might want to apply a little blue loctite to the side of the charger you're going to use. We didn't do it ourselves, as we figured most people are only going to use the charger on one side the gun, and screw the other one off. You could argue that it would/could be used in an off hand shooting situation, but with the upper being so heavy, probably not that type of gun.

  8. #8
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    Quote Originally Posted by UWone77 View Post
    I forgot to mention, you might want to apply a little blue loctite to the side of the charger you're going to use. We didn't do it ourselves, as we figured most people are only going to use the charger on one side the gun, and screw the other one off. You could argue that it would/could be used in an off hand shooting situation, but with the upper being so heavy, probably not that type of gun.
    Definitely. The set up as is seems more like a bipod set up. I'm thinking about borrowing a slide fire and giving it a go off of a bipod....LOL

    Were you shooting this suppressed or did you just do the adjustable gas block just because?

    I'm holding off on the loctite until I get a better feel for it. I like having my right hand on the grip and charging with my left. That part is pretty nice. That said its a series of trade offs.

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    Quote Originally Posted by alamo5000 View Post
    I have no experience with adjustable gas blocks but it appears this one had already been adjusted. The net result was that the gun seemed to be stroking kind of weird to some degree. It was blowing back far enough to eject brass and pick up another round, but not far enough back to lock the bolt back when the mag was empty. The brass was also being ejected in a different position than normal.
    Try turning the set screw counter clock wise a click or two. That will open up the gas port a bit and help lock it back. Let's see some groups. :)

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    Quote Originally Posted by BoltFace927 View Post
    Try turning the set screw counter clock wise a click or two. That will open up the gas port a bit and help lock it back. Let's see some groups. :)
    I am not that familiar with how adjustable gas blocks actually (mechanically) function. Well, to be honest I have never used one at all so I am a complete noob. There is no time like the present to learn. I've gathered that this one has a bunch of 'clicks', or settings, that turn the forward screw either in or out. Righty tighty, lefty loosey.

    What I want to do is start out with it all the way closed (or open) so that it functions like a standard gas block. I guess my stupid question of the day is, if the front screw is out (like you are loosening the screw) does that bleed off more gas or force more gas down the gas tube?

    I basically want to test out how the upper feels and if there is noticeable side gas blast if I was using a standard gas block. It will also tell me how essential an adjustable block would really be for the ambi charger as well as save me some time and ammo figuring it out on my own.

  11. #11
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    The screw simply opens the gas port up more or closes it off more. Generally, people like to use adjustables on gas ports that are too big to start off with.

  12. #12
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    Which direction opens it and which direction closes it?

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    Nice write up and kudos for all the pics...

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    Quote Originally Posted by alamo5000 View Post
    Which direction opens it and which direction closes it?
    From the manufacturer:
    Turn the gas screw to the desired setting. Unscrewing the screw opens the gas hole in the block to allow more gas flow (more pressure) and screwing the screw in closes the gas hole reducing the gas flow (less pressure). You should feel a click every ¼ turn of the gas screw. You may leave the screw at any click position you desire.

    So, turning to the right screws it in and reduces the gas flow, while turning to the left screws it out and increases the gas flow. Hopefully the clicks on that one are a bit more pronounced than the one I tried.

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    Quote Originally Posted by Eric View Post
    From the manufacturer:
    Turn the gas screw to the desired setting. Unscrewing the screw opens the gas hole in the block to allow more gas flow (more pressure) and screwing the screw in closes the gas hole reducing the gas flow (less pressure). You should feel a click every ¼ turn of the gas screw. You may leave the screw at any click position you desire.

    So, turning to the right screws it in and reduces the gas flow, while turning to the left screws it out and increases the gas flow. Hopefully the clicks on that one are a bit more pronounced than the one I tried.
    Thanks for the find/info bro!

    When I get a chance to shoot I am going to give it a go on some different settings. More than anything I want to know if people buy this product and it turns out that they 'need' or would most likely 'prefer' an adjustable block (and not just for suppressed shooting) that would be need to know information. With that whole side port open it's still an unknown.

    Quote Originally Posted by mustangfreek View Post
    Nice write up and kudos for all the pics...
    Thank you!

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