Review: LMT Defense DMR556 Stock

LMT’s DMR556 Stock is a precision oriented adjustable stock that has LMT’s SOPMOD finger prints all over it. While it is sure to draw comparisons to the Magpul PRS Stock, the DMR556 packs a lot of unique features that set it apart including one that puts this head and shoulders above anything else I have tried.

LMT Defense DMR556


The DMR556 is a drop-in, adjustable stock designed for AR-15 based precision rifles. It is adjustable for length of pull (LOP) and comb height, features two QD sling swivel locations on each side (total of four), and has a covered lower rail section for mounting a rear mono-pod. Best of all, the DMR556 can be mounted on any mil-spec dimension carbine receiver extension (buffer tube).

Both the LOP and comb height dials click into position as you rotate them to help keep your adjustments repeatable. The LOP can be finely adjusted at the dial or more coarsely adjusted by moving the stock’s position on the receiver extension.

This stock looks similar at first glance to the Magpul PRS because they are both descendants of the HK PSG-1 stock. The LMT differentiates itself with several features including the ability to mount on a carbine receiver extension and built in QD sling swivel mounting points as mentioned before. It also has LMT design elements throughout including a SOPMOD stock inspired cheek piece and the same buttpad as the SOPMOD stock.

LMT Defense DMR556 Top Down

Observations from Use

This stock has a lot of great features but none are greater than the way it mounts to a mil-spec carbine receiver extension. The stock simply slides on and is retained by a spring loaded pin that locks into the stops on the receiver extension. This is excellent for several reasons. First, it allows you to more easily tune your recoil spring and buffer set up with heavier buffers, extra springs, etc as there is a much wider variety of items like this for carbine receiver extensions than there are for rifle length extensions. It will even fit on Vltor’s excellent A5 receiver extensions though there will be a slight gap at the front of the stock which is not a big deal. Second, it allows the user to adjust the length of pull in a more coarse way than the dial allows by moving the stock forward or back on the receiver extension.

Finally, the stock mounting setup allows the user some impressive modularity. Let’s say you have a carbine built up to be something of a light precision or RECCE configuration with a precision barrel and low power magnification optic like a 1-4x or 1-6x. With a carbine like that, you may want a more compact, lighter adjustable stock on it at times and you may want a no-compromise precision stock on it at other times. The DMR556 allows you to accomplish that easily without the need to swap buffer tubes. You simply use the tip of a bullet or similar object to compress the retention pin and slide the stock off of or on to the receiver extension. It couldn’t be much easier.

LMT Defense DMR556 Retainer Pin

The cheek piece is excellent. It has the familiar flared SOPMOD stock shape. On the SOPMOD stock, those flares serve to house the extra battery storage and enhance cheek weld. On the DMR556, there is no battery storage and the flares are in place solely to enhance the cheek weld which they do well. The use of a SOPMOD buttpad works well here too. The rubber texture locks it into your shoulder and, as SOPMOD users already know, the rounded edges make it easy to roll the rifle up to your shoulder from a low ready position.

The stock has a covered bottom rail that is easily accessed by prying the cover off. The rail is useful for those who use a rear mono-pod. When the cover is in place, it creates a very long flat surface that settles into a rear shooting bag nicely. I don’t use a mono-pod but I do use shooting bags and I really appreciate the shape of this stock on the bag. The club foot area works well whether you are on a shooting bag or not. It is the perfect place to put your support hand when the front of your rifle is supported.

LMT Defense DMR556 Front

The four built in QD sling swivel sockets are greatly appreciated. I use mine to mount the excellent Armageddon Gear Precision Rifle Sling that I use on my precision AR. It is nice that these mounting points don’t have to be purchased separately and that they have both a low and high mounting position on both sides of the stock. If I could change one thing about the stock it would be to make the sling swivel mounts rotation limited. The free spinning sockets are a disappointment on an otherwise excellent stock.

The LOP and comb height dials are easy to turn, even with gloved hands. The detent action in each position is strong and positive. You can easily feel each click and I had no issues with my adjustments moving once they were set. I used a paint pen to witness mark my adjustments.

The DMR556 fit every mil-spec receiver extension that I tried from several different manufacturers including Colt, BCM, LMT, Vltor, Spike’s Tactical, and more. There is minimal movement and zero rattle with the stock mounted.

LMT Defense DMR556 Pad

Wrap Up

The ability to mount the DMR556 on a standard mil-spec carbine receiver extension takes this stock to another level. It is the greatest feature on a stock that is packed with great features. The added QD swivels are a big plus but I really wish they were rotation limited. The SOPMOD design elements remind the user that this is an LMT product and they aren’t just there for branding. They are also functional. This is an EXCELLENT precision stock for the AR-15.

Check out the DMR556 at LMT Defense.

Disclosure: The DMR556 was provided to me free of charge for review by LMT Defense.

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2 Responses to Review: LMT Defense DMR556 Stock

  1. NineWays September 3, 2015 at 05:13 #

    So what you’re saying is that, if LOP was manageable, this would work just fine with a Law Tactical folder?

    • Matt September 3, 2015 at 07:33 #

      It would.

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