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Monstrum Slim Profile Series Offset Cantilever Picatinny Scope Mount

4.6 4.6 out of 5 stars 7,222 ratings
Price: $28.95 Free Return on some sizes and colors
Black

  • Dual ring scope mount available for both standard 1 inch and standard 30mm tube rifle scopes
  • Slim profile design offers the weight of lightweight scope rings with the added rigidity and convenience of a one piece mount
  • Mounts to any flat top Picatinny rail equipped rifle
  • 2 inches of forward extension allows extra flexibility for optimum eye relief and shooting position
  • 5 ounces in weight and 5 inches in total length, with a base of 3 inches and 2.5 inches of spacing between the rings
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    About Us:

    Monstrum is the leading manufacturer of affordable, high quality rifle optics and accessories. We have over 15 years of experience in engineering and manufacturing scopes.

    Our optics are designed to provide superior performance in any environment. Whether you’re hunting in the woods or shooting at the range, we have the perfect scope for you.

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Product Description

monstrum-tactical-optics-scopes-accessories-rails

MONSTRUM-TACTICAL-6061-AIRCRAFT-GRADE-ALUMINUM

MONSTRUM-TACTICAL-1-INCH-ZR251-SCOPE-MOUNT

MONSTRUM-TACTICAL-SCOPE-MOUNT-INTEGRAL-RECOIL-STOPS

Weighs in at a mere 6 ounces!

Crafted from 6061 Aircraft Grade Aluminum. At a weight comparable to a set of lightweight rings, it provides the added rigidity and convenience of a one piece mount.

Built specifically for 1 inch scopes.

The mount is built for standard 1 inch tube scopes for mounting to any standard Picatinny rail equipped rifle.

Square Integral Recoil Stops

This scope mount also features 4 square-integral recoil stops, which allows us to shave down the weight, while increasing the strength.

Technical Specifications

Total Length: 5.5 inch
Base Length: 3.0 inch
Ring Space: 2.38 inch (Distance Between Rings)
Compatibility: 1 inch Rifle Scope Tubes
Profile Height: 1.0 inch
Forward Extension: 2.0 inch
Center Height: 1.6 inch (Center of Reticle to Top of Rifle Mount)
Scope mount chart
monstrum-scope Monstrum S-Series Quick Release Scope Mount Monstrum Extended Series Scope Mount ZS256
ZR301/ZR251 Monstrum Slim Series Cantilever Scope Mount ZR252/ZR302 Monstrum QR Cantilever Scope Mount ZS308/ME308 Monstrum Extended Series Cantilever Scope Mount ZR256 Monstrum Pro Series Cantilever Scope Mount
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Customer Reviews
4.6 out of 5 stars
7,222
4.4 out of 5 stars
2,512
4.7 out of 5 stars
761
4.7 out of 5 stars
158
Price $28.95 $29.99 — —
Weight: 5.0 oz 5.8 oz 5 oz 5.6 oz
6061 Aircraft Grade Aluminum: ✓ ✓ ✓ 7075 Aluminum
Hardened Steel Hardware: ✓ ✓ ✓ ✓
Locking Mechanism: (Mount to Rifle) Torx Bolts Quick Release Torx Bolts Torx Bolts
Ring Space: (Distance Between Rings) 2.4 in 2.4 in 2.8 in 2.8 in
Base Length: 3.0 in 3.0 in 3.5 in 3.0 in
ZS105 Monstrum ZS311 30mm Scope Mount and 45 Degree Venom Micro Red Dot Mount ZS312 ZS113
ZS105 Monstrum Ultra Series Cantilever Scope Mount ZS311 Monstrum Cantilever Scope Mount with 45 Degree Red Dot Mount ZS312 Monstrum Cantilever Scope Mount with Level Bubble ZS113 Monstrum Razorclaw Series Scope Mount
See Details
See Details
See Details
Customer Reviews
4.5 out of 5 stars
125
4.5 out of 5 stars
117
4.5 out of 5 stars
130
4.7 out of 5 stars
176
Price — $38.99 $45.00 $29.99
Weight: 5 oz 4.6 oz 6 oz 3.7-3.9 oz
6061 Aircraft Grade Aluminum: ✓ ✓ ✓ ✓
Hardened Steel Hardware: ✓ ✓ ✓ ✓
Locking Mechanism: (Mount to Rifle) Torx Bolts Torx Bolts Torx Bolts Torx Bolts
Ring Space: (Distance Between Rings) 2.79 in 2.7 in 2.7 in 2.8 in
Base Length: 3.0 in 3.0 in 3.0 in 3.0 in

Product information

Technical Details

Additional Information

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Customer reviews

4.6 out of 5 stars
4.6 out of 5
7,222 global ratings

Customers say

Customers like the quality, tightness, performance, and weight of the aiming scope sight. For example, they mention it's well-made, holds the scope securely, and works great for any reasonable normal use. Some are also happy with ease of installation, appearance, and value. That said, opinions are mixed on fit.

AI-generated from the text of customer reviews

480 customers mention438 positive42 negative

Customers are satisfied with the quality of the aiming scope sight. They mention it's well-made, sturdy, and stable. Some say that the threading seems to be good quality, but some screws stripped. Overall, most are happy with the product's quality and value.

"...Easy to mount, slim profile and seemingly solid design for a much better price. Should hold up just fine to an AR style rifle...." Read more

"This scope mount is a good mount for the money, its light, well made and has locking lug on the bottom of the mount so it rock solid, comes in 1"..." Read more

"Installed on an LR 308 with a vortex crossfire 1” scope. Mount seem well made and installed easily...." Read more

"Love how simple it is. Sturdy and well built" Read more

281 customers mention278 positive3 negative

Customers appreciate the value of the aiming scope sight. They say it's one of the best affordable mounts they've ever used and works great for the price.

"...Easy to mount, slim profile and seemingly solid design for a much better price. Should hold up just fine to an AR style rifle...." Read more

"This scope mount is a good mount for the money, its light, well made and has locking lug on the bottom of the mount so it rock solid, comes in 1"..." Read more

"...in place after 40 rounds of .243 Winchester; nice mount and a great price." Read more

"Decent mount for a decent cost.." Read more

158 customers mention143 positive15 negative

Customers are satisfied with the performance of the aiming scope sight. They mention that it works great for any reasonable normal use, is strong yet light weight, and works for their needs without breaking the bank. Some say that the mount works even better than the price they paid for it.

"Works great, seems like the additional screws will be a solid thing. Easy to mount, slim profile and seemingly solid design for a much better price...." Read more

"...Bottom line, these mounts work well...." Read more

"Worked perfect for what I needed no lapping was needed" Read more

"...Stop complaining! Install when amazingly smooth. no issues...." Read more

133 customers mention133 positive0 negative

Customers are satisfied with the appearance of the aiming scope sight. They say it looks great, the finish is very nice, and the machining is as good as others. The FDE color looks great and really sets off the rifle. The mount is effectively designed and durable. The chamfer on the base adds some elegance and reduces weight.

"...These mounts are lightweight, strong, and I really like their design...." Read more

"Fit perfectly on my upper. FDE color looks great and really sets off the rifle!" Read more

"...Holds steady and looks great!" Read more

"Beautiful" Read more

106 customers mention103 positive3 negative

Customers find the installation of the aiming scope sight to be easy. They mention that it holds up well, and is easy to install and adjust. Some say that it's good and solid, and holds up to any rifle.

"...Easy to mount, slim profile and seemingly solid design for a much better price. Should hold up just fine to an AR style rifle...." Read more

"Love how simple it is. Sturdy and well built" Read more

"Easy to mount and stable" Read more

"Mounting was easy and the platform provided a very stable base for my scope. It also costs a fraction of what a name brand base would cost!" Read more

85 customers mention73 positive12 negative

Customers like the tightness of the aiming scope sight. They say it holds the scope securely, and the screws stay tight. Some say the mount provides a very secure mounting system for their scope, and that it hasn't budged after a couple thousand rounds.

"...mount is a good mount for the money, its light, well made and has locking lug on the bottom of the mount so it rock solid, comes in 1" and 30 mm" Read more

"...The scope and mount remain securely in place after 40 rounds of .243 Winchester; nice mount and a great price." Read more

"...Bottom line, these mounts work well. They hold zero, they’re fairly robust, and they even come with extra hardware... which is always a good thing..." Read more

"...It has a full-length clamping rail secured by four bolts. Impressed so far!" Read more

68 customers mention61 positive7 negative

Customers like the weight of the aiming scope sight. They say it's lightweight, perfect for a lightweight DMR setup, and less bulky than other mounts. Some mention that it'll work well without sacrificing strength.

"This scope mount is a good mount for the money, its light, well made and has locking lug on the bottom of the mount so it rock solid, comes in 1"..." Read more

"...These mounts are lightweight, strong, and I really like their design...." Read more

"...I am impressed with this scope mount for good blending of it's lightweight slim design, and it's sturdiness and stability...." Read more

"...The weight is pretty decent and I liked the color of the finish but the mount raised the scope up higher than I would have liked, the finish was soft..." Read more

152 customers mention98 positive54 negative

Customers are mixed about the fit of the aiming scope sight. Some mention that it fits well, while others say that it didn't fit. Some say that the top rings are undersized and the bolts are relatively small diameter.

"...Easy to mount, slim profile and seemingly solid design for a much better price. Should hold up just fine to an AR style rifle...." Read more

"...I’ll freely admit that these mounts lack the fit and finish of most top tier mounts that cost $100 and well above...." Read more

"Fit perfectly on my upper. FDE color looks great and really sets off the rifle!" Read more

"Put it on an AR-15 with a vortex lpvo,shot 200 rounds and it stayed nice and tight,liked it so much I already ordered a second one." Read more

Satisfactory mount at a great price
4 Stars
Satisfactory mount at a great price
I used my Wheeler alignment/lapping kit on this to see how good it was.Alignment was good between both rings. The pictures from lapping speak for themselves--looks like the mount needed it. The machining left some grooves in one of the top ring halves. In fairness, I didn't keep track of the top pieces the first time I took it apart--it may have done better if I'd marked them first thing.The threading seems to be good quality but the screws turned roughly in the holes. From what I can tell, they are not tapping the holes oversize to account for the added thickness of the anodizing. I ended up chasing all the threads with a tap to clean them up and the screws turned a lot more easily. I don't think this is something you _need_ to do.I already had the lapping kit and tap so no additional cost for me, but I spent a couple hours getting the mount up to the next level. I don't have a lot of spare time these days so in retrospect I think I would jump to the $60 range where less fussing would be required (but let's be honest I might have fussed with a fancier mount, too). And I have heard of folks needing to lap nicer mounts.Overall good value for the money. IMO most scope mounts are ridiculously overpriced for what they are. Nice to see these at a price regular folks can afford. $100 scope plus $30 dollar mount will work just fine for most folks (not everyone is trying to shoot a hair off a fly at 200 yards).
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Top reviews from the United States

Jake
5.0 out of 5 stars Pretty Solid
Reviewed in the United States on March 22, 2024
Color: BlackSize: 30 mmVerified Purchase
Works great, seems like the additional screws will be a solid thing. Easy to mount, slim profile and seemingly solid design for a much better price. Should hold up just fine to an AR style rifle. Not sure about something with heavier recoil though.
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HACKSAW
5.0 out of 5 stars SCOPE MOUNTS
Reviewed in the United States on February 23, 2024
Color: BlackSize: 1 inchVerified Purchase
This scope mount is a good mount for the money, its light, well made and has locking lug on the bottom of the mount so it rock solid, comes in 1" and 30 mm
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TR
5.0 out of 5 stars Watch your torque
Reviewed in the United States on January 5, 2024
Color: BlackSize: 1 inchVerified Purchase
Installed on an LR 308 with a vortex crossfire 1” scope. Mount seem well made and installed easily. There are no instructions for the torque of the screws, use caution when tightening the steel screws into the aluminum body. I torqued the mount screws to 30 inch pounds and the rings to 18 inch pounds per the scope manufacturer recommendation.
The scope and mount remain securely in place after 40 rounds of .243 Winchester; nice mount and a great price.
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Marshall Nichols
4.0 out of 5 stars Good quality
Reviewed in the United States on March 14, 2024
Color: BlackSize: 1 inchVerified Purchase
Decent mount for a decent cost..
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Herb
5.0 out of 5 stars Great mounts for the price!
Reviewed in the United States on April 12, 2023
Color: BlackSize: 30 mmVerified Purchase
I have ordered several of their products. Overall for the money they are great, manufacturing standards are not the highest, but then again for the price you can't beat it! These mounts are lightweight, strong, and I really like their design. The screws are aluminum and that is a drawback if used on any gadget, you must torque them to proper value or the head will strip. I had that happen to me on one of them, but I sent email to company and I got replacements quickly!!! Overall I say that you can't go wrong with these mounts. I would recommend this purchase to anyone. Price is excellent and the product is good! Monstrum has been on my favorites list since I got these.
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eric
5.0 out of 5 stars Great
Reviewed in the United States on April 5, 2024
Color: BlackSize: 1 inchVerified Purchase
Love how simple it is. Sturdy and well built
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ShaunHinton
5.0 out of 5 stars Perfect fit!
Reviewed in the United States on March 6, 2024
Color: Flat Dark EarthSize: 30 mmVerified Purchase
Fit perfectly on my upper. FDE color looks great and really sets off the rifle!
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Rob
5.0 out of 5 stars Repeat customer. I’ve had really good luck with these.
Reviewed in the United States on June 24, 2020
Color: BlackSize: 1 inchVerified Purchase
This is the third cantilever mount I've purchased from Monstrum. I have one holding a Vortex Crossfire II on my small game AR, one holding a Leupold 1.5-4x LPVO scope on my home defense setup, and this third just installed on my AR10 DMR build, waiting on a Primary Arms SLX 4-14x HUD illuminated reticle. I mention the builds and optics because many of you reading this review may be as skeptical as I was of using a $30 mount for $200-$300 optics.

I’ll freely admit that these mounts lack the fit and finish of most top tier mounts that cost $100 and well above. However, they do perform way outside their price point, and I’m all about saving money fore more guns and optics if I cans find a RELIABLE affordable option. Also worth mentioning, I do use blue threadlocker on all hardware on all optics and mounts that I use, and I would recommend you do the same, regardless of what mount you use.

Bottom line, these mounts work well. They hold zero, they’re fairly robust, and they even come with extra hardware... which is always a good thing to have. They wouldn’t be my first choice in gear to deploy with, but the quality you get at the rock-bottom-dollar “made of chinesium” budget construction of these things should be more than enough for the average shooter.
5 people found this helpful
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