Samson DMR Scope Mount

samson dmrReview: Diego Ruina
Translator: Marco Terzi

When it is about fitting the scope on a rifle, single rings are more and more replaced by one-piece scope mounts. Available either with quick release locking or with traditional hex screws, Torx or Allen types, they are appreciated particularly for the easy and quick installation, and furthermore they are designed with optimal sizes and heights regarding the placement of the scope on the rifle. Even though there are some mounts exactly designed to be attached on some specific type of weapon, the Picatinny rail has become the standard interface for all of them.

The SAMSON DMR mount with 35mm ring and an IOR scope: both height and position are perfectly compliant with the size of an AR rifle.
The SAMSON DMR mount with 35mm ring and an IOR scope: both height and position are perfectly compliant with the size of an AR rifle.

After an initial use on weapons made according military platforms (AR15 etc.), over time the single piece scope mounts have set in on precision shooting guns, being them bolt-action or semi-autos, reaching an high quality level. Of course, quality and reliable parts can be pricey. Today, on the market there are several solution from many producers, making it possible to choose the better configuration regarding height, length, distance between the rings, scope diameter and inclination. Regarding the fastening system, many producers have patented their solution regarding the quick or traditional release, always trying to guarantee the best position’s reliability and the repetitiveness of the “zero” settings in case of disassembling, by working on the mechanical tolerances, free play and better locking system on the picatinny rail.

The two locking levers on the left side
The two locking levers on the left side

Generally, a good base sets on a price range closer to a good pair of rings: starting from 200-220 euros minimum, up to 500 euros in some cases, for the most advanced versions. The average price of a good scope mount of this type is more on 200 to 300 euros. If purchased on the American market, it can cost some less, but then we have to take into account shipping and custom costs, plus VAT.
Unfortunately, the availability of these items on our market is not always good, which obliges us to look beyond borders, indipendently of price factor. At the time of choosing the base we need, it will be better to evaluate the kind of optics and the

The two adjustable ring nuts on the right side
The two adjustable ring nuts on the right side

weapon it is going to be mounted on. It is actually important to select the right height to avoid a later add-on of a spacer to increase the height of the scope, or even worst, to find out that it is too high once fitted in. The type of base is also important, as it is fundamental to verify the distance between the rings and the so-called “offset”, meaning how much the rings are placed forward . The distance between the 2 rings is also important, because there may be optics with a quite bulky turret section, therefore the rings may not fit between the rings.

Detail of the left isd of DMR base
Detail of the left isd of DMR base

The offset will be important to understand where will be the final position of the scope on the weapon, in order to have the proper distance from the eye without any problem from the position of the base on the weapon’s frame.
Generally, the producers are providing useful measures and data in order to select the proper model. Better take your time to check that everything is fine.
A product line which is not really well

 A top view of the DMR
A top view of the DMR

know is proposed by Samson MFG, named DMR Scope Mount equipped with the RAM (Rotary Actuated Mount) locking system.
The DMR is available in a remarkable number of versions regarding inclinations, ring diameter (one of the few with a 35mm version), distance between the rings and offset distance. It is actually easy to find the one which is perfectly matching with our needs. The price on the producer’s web site range from 175 to 215 USD, taxes no included

Deatil view of the lower side of the base and the 2 locking points, machined to be lighter
Deatil view of the lower side of the base and the 2 locking points, machined to be lighter

(to be paid only if purchasing locally). As for other Samson accessories, it is possible to purchase them on line from abroad too, and by contacting the customer care service it is possible to agree upon a specific shipping method, from mail service to faster and safer global freight agent.
Let’s see our DMR in detail,; it is a quick release locking system , with adjustable locking force so to guarantee the optimal hold on our weapon. The RAM bases are made of 6061 T6

The two lever in opening position
The two lever in opening position

aluminum, with military grade black anodizing coating, while the locking systems are made of steel. The product is shipped in an anonymous but sturdy box made of withe cardboard, and the base is wrapped around with some Pluriball, plus the datasheet. Nothing fancy around here. Not even the usual Allen key or a single-use blister of brake fluid. The base is showing a nice and uniform finish, with the laser markings on the lower side of the locking tenons. The body of the base is showing a

Lower side view of the locking system
Lower side view of the locking system

series of drilling holes and an internal machining to reduce weight. The rings are made in 2 pieces each, the lower half of the ring is mounted by 2 screws on the base, while the upper half ring is held in place by 4 screws. Each single female thread is made by a HELICOLI bushing, so to guarantee a strong hold and to avoid the screws to work directly on the aluminum.
The rings have a 25 mm width, and they are machined in the lower side in order to match with the relevant groove on the

Locking levers in closing position before locking them into the grooves
Locking levers in closing position before locking them into the grooves

base. The screws are tighten up with brake fluid. The alignment between the rings has been checked by a rectified steel bar and some abrasive paste, and it was fine.
The locking system is provided with two independent set of steel levers, the closing is obtained by rotating the levers clockwise. The rotating stroke of the levers ends with a pin pushed by a spring which is avoiding the accidental release of the lever. Therefore, to operate the quick release, it will be first

Right side view, showing the screws to adjust the tightening force of the base
Right side view, showing the screws to adjust the tightening force of the base

necessary to release the lever from the safety pin, rotate it towards outside to clear from the groove, and the rotate the lever counterclockwise to release the base.
The tension of the 2 screws is adjustable. The factory setting is made according to the military standard for Picatinny rail 1913, but it is known that from one producer to another there may be slight differences on the tolerances. A simple adjustment ring nut mechanism allows setting the 2 levers

Detail view of the adjustment locking rings, it is enough to push with the tip of a cartridge to let them rotate to increase the tightening force, as explained in the instructions
Detail view of the adjustment locking rings, it is enough to push with the tip of a cartridge to let them rotate to increase the tightening force, as explained in the instructions

independently. The correct procedure for zeroing and tightening is mentioned on the instruction sheet. Once properly adjusted, the release is quite effortless. We have decided to test this RAM base moved by the curiosity to evaluate a new product, and having to make the test with 35mm scope on a AR chambered in 308w would not leave too many alternatives. The 35mm size is not so widespread on scope tubes, but it is the standard for Romanian IOR optics, in this case it is a 1.5-8×26 with illuminated reticle and bullet drop

View of the disassembled rings, each one has 4 screws. The tightening of the screws has to be done according instruction sheet about maximum torque and in cross order.
View of the disassembled rings, each one has 4 screws. The tightening of the screws has to be done according instruction sheet about maximum torque and in cross order.

compensation’s knob (we will analyze the scope in detail in a further article).
Except for a problem regarding the model we have received, due to a misunderstanding at ordering (which was promptly and free of charge solved by the producer) the bas has shown no failures, or difficulties about mounting and adjustment. The position of the scope is optimal for bench or stand up shooting. We have performed a test about zeroing repetitiveness at the range: after zeroing the scope, we have shot a series of rounds, released and

Detail of the female thread of the half ring, in each thread the HELICOIL bushing is clearly visible
Detail of the female thread of the half ring, in each thread the HELICOIL bushing is clearly visible

tighten up again the base and shot some more rounds. There was no visible changes on the target before and after releasing the base. In conclusion the DMR is a good product, available in different versions and offered to a price which is aligned with the market sector. It is an ideal mounting for AR15 and Ar10 platforms, but also for any weapon where you want to put a scope on, easily and without too many settings. The availability of 20 and 30 MOA inclined bases make it a suitable option for long range shooting rifles, or on short barrels semiauto rifles, where the bullet drop is very significant on long distances due to lower muzzle velocity.

 

 


© Copyright 2016 Diego Ruina, All rights Reserved. Written For: Armi Militari English

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