Griffin Armament GPM Scope Mount/Ring Combo – 34mm Tube, 1.35" Height, 0 MOA, Black (GSM135H34MM / 689396839977)
Give your precision rifle a rock-solid, feature-rich optic platform with the Griffin Armament GPM Scope Mount/Ring Combo, model GSM135H34MM. Designed by Army snipers and built in-house in Watertown, Wisconsin, this 34mm standard GPM mount delivers uncompromising rigidity, repeatable return-to-zero, and unmatched accessory flexibility for today’s LPVOs and precision optics.
With a 1.35" optical centerline height and 0 MOA cant, this mount is ideal for flat-shooting rifles where you want a true optical zero and natural cheek weld—perfect for AR-style rifles and precision bolt guns running 34mm scopes.
Key Features – Griffin GPM 34mm Scope Mount (GSM135H34MM)
Tube Diameter: 34mm – fits modern precision and LPVO optics
Height: 1.35" (rail-to-centerline) – standard height for ARs and many precision setups
Cant: 0 MOA – keeps your scope’s internal elevation centered for general-purpose use
Material: 6061-T6 aircraft-grade aluminum alloy
Finish: Type III hardcoat anodized, black
Construction: Unibody, precision-machined and inspected to <0.0002" tolerances
Interface: STANAG 4694-compliant Picatinny rail attachment for precise return-to-zero
Weight: Approx. 0.63 lb (about 10 oz)
Technology: AIS™ (Accessory Interface Suite) & RTO™ (Rapid Transition Optic) compatible
Model / SKU: GSM135H34MM
UPC: 689396839977
Designed by Army Snipers – Built for Precision
The Griffin Precision Mount (GPM™) family was created by shooters who live and breathe precision rifle work. Combining over 20 years of machining experience with Army sniper DNA, Griffin designed the GPM line to offer sniper-grade performance at a civilian-friendly price point.
Machined and probed in-house from aircraft-grade 6061-T6 aluminum for exceptional strength-to-weight.
Individual datum probing drives every machining operation, ensuring peerless dimensional consistency across the mount.
Tolerance accuracies held to less than 0.0002", promoting true alignment between rings and rail.
If you’re serious about dialing dope, confirming zero, and relying on your rifle under pressure, this mount is engineered for that level of precision.
AIS™ Accessory Interface Suite – Five Mounting Surfaces
One of the standout features of the GPM mount is its patented AIS™ (Accessory Interface Suite):
The unique design splits the rings on two parallel but offset planes, creating five AIS mounting surfaces:
Top
Left
Right
45° left
45° right
These surfaces accept AIS-compatible accessories such as micro red dot plates, laser rangefinders, or other electro-optics.
This means you can build a fully integrated optics ecosystem directly off your primary scope mount, with ambidextrous options for both left- and right-handed shooters.
RTO™-Ready – Rapid Transition Optics Support
The GPM Scope Mount is also RTO™ (Rapid Transition Optic) capable, letting you mount a secondary, non-magnified optic exactly where you want it:
RTO plates position micro red dots at about a 40° roll off your primary optic, aligned with your stock comb for a natural, heads-up sight picture.
Supported platforms include popular micros from Trijicon, Aimpoint, SIG Sauer, Holosun, Vortex, Leupold, Burris, and Griffin’s own Micro Sight (GMS), via appropriate AIS/RTO plates.
With this setup, you can switch from magnified to non-magnified aiming with a simple roll of the rifle—ideal for PRS gas gun matches, 2-gun/3-gun stages, or patrol rifles that must handle both CQB and distance.
Robust Unibody Construction & Return-to-Zero Performance
The unibody base of the GPM scope mount cradles your 34mm optic and ties the entire system together over multiple Picatinny slots:
STANAG 4694-compliant attachment profile helps ensure precise repeatability and return-to-zero even after removal and reinstallation.
Dowel pin alignment system enhances structural rigidity and maintains alignment under recoil and hard use.
Type III milspec hardcoat anodizing protects against wear, corrosion, and harsh field conditions.
Combined, these features make the GPM mount a true “set it and forget it” solution for rifles that live in real-world environments—not just on a bench.
34mm, 1.35" Height, 0 MOA – Optimized for Modern Optics
This specific GSM135H34MM configuration hits the sweet spot for many 34mm scopes:
34mm tube compatibility fits popular high-end optics from brands like Nightforce, Vortex, Kahles, Steiner, and more.
1.35" centerline height is ideal for AR-15 and AR-10 style rifles where a slightly elevated optic provides a comfortable cheek weld and clears backup sights or laser/IR devices.
0 MOA cant is perfect for general-purpose carbines or rifles where you’re not maxing out elevation, ensuring plenty of internal adjustment for varied distances.
For most duty, hunting, and competition builds, this spec combination provides the right balance of ergonomics and ballistic flexibility.
Lightweight Yet Strong – Smart Use of 6061-T6
Rather than overbuilding with unnecessary mass, Griffin chose 6061-T6 aluminum, matching what many optics themselves are made from:
For shooters who carry their rifles all day—LE, hunters, or competitive shooters—this weight-conscious design helps keep your setup manageable without sacrificing performance.
What’s in the Box – Complete Mounting Kit
The Griffin Armament GPM 34mm Scope Mount/Ring Combo ships with everything you need to mount your optic correctly:
34mm Standard Griffin Precision Mount™ (GPM)
(12) #8-40 T15 ring screws for clamping the scope
(4) #10-32 fiber-lock patched T15 rail screws for securing the mount to the Picatinny rail
T15 Allen key
Shim set to help set the proper gap and level your optic
GPM manual with torque guidance and installation tips
With the included hardware and instructions, you can confidently install your scope and hit the range with a properly secured and aligned optic.
Ideal Applications – From Precision Gas Guns to Duty Rifles
The Griffin Armament GPM Scope Mount/Ring Combo 34mm (GSM135H34MM) is a top choice if you:
Run a 34mm LPVO or precision scope on an AR platform or tactical bolt gun.
Want AIS/RTO modularity for adding backup red dots or future electro-optic accessories.
Need a mount with true return-to-zero and proven durability under recoil and field use.
Prefer gear that’s American-made, engineered by shooters who understand precision and real-world demands.
Whether you’re building a competition gas gun, a patrol rifle, or a long-range hunting setup, this GPM mount forms a rock-solid foundation for your glass.
At-a-Glance – Griffin Armament GPM 34mm Scope Mount/Ring Combo Black
Brand: Griffin Armament
Series: GPM™ (Griffin Precision Mount)
Model / SKU: GSM135H34MM
UPC: 689396839977
Tube Diameter: 34mm
Height: 1.35" (rail-to-centerline)
Cant: 0 MOA
Material: 6061-T6 aircraft-grade aluminum
Finish: Type III hardcoat anodized, black
Construction: Unibody, AIS™ & RTO™ compatible, STANAG 4694 Picatinny interface
Weight: ~0.63 lb
Included: Mount, T15 hardware, Allen key, shim set, manual
If you’re ready to step up to a sniper-grade, modular scope mount that’s built for today’s optics and tomorrow’s accessories, the Griffin Armament GPM Scope Mount/Ring Combo Black 34mm Tube GSM135H34MM is a smart, long-term upgrade for any serious rifle.
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