ABOUT Kaimai® Rifle Suppressors
SILENZ rifle suppressors was formed in early 2014 with the goal of designing and producing a range of lighter weight suppressors, but with better features and durability compared with some other light weight aluminium type suppressors that were available on the market in New Zealand at the time.
The track record for 100% reliability and high performance has been unsurpassed by any other NZ suppressor manufacturer, with the early prototype/trial suppressors still in active service with professional hunters (in excess of 4000 rounds and counting) where with the same type of use some of their previous units seemed to habitually fail in under 800 rounds.
In April 2016 SILENZ Suppressors merged to become part of D.F. Maisey Gunsmithing & Firearm Accessories in Tauranga, to be a valuable addition to the line-up of other high-quality firearm-related products manufactured there.
From May 2017 SILENZ has re-branded to KAIMAI® Rifle Suppressors, and this is complementary to the new Kaimai MPR suppressed custom rifles produced by D.F. Maisey Gunsmithing ( www.kaimairifle.co.nz ). The re-branding acknowledges our geographical location, and recognises the significance of the ranges to our local hunting history.
(KAIMAI and Silenz are registered trademarks of D.F. Maisey Gunsmithing.)
Most centerfire suppressors are designed to reduce about 70% – 80% of peak gunshot noise when firing full-power high-velocity ammunition. Generally, this equates to an approximate 17-32dB reduction when tested with correct sound impulse measuring equipment (with a rise time of 0.002 sec or less). Note: – cheap, general purpose hand-held sound meters are not suitable for testing gunshots accurately. Any dB readings gained with these, or i-phone apps, are essentially worthless and misleading.
Suppressors will not reduce the mechanical noise of a firearm, and it will not reduce the supersonic crack of the bullet (if travelling through the air faster than the speed of sound – @ 330mls, or @ 1080fps).
For full-silent operation, a bolt action or single-shot rifle, with subsonic ammunition and a suitable suppressor/silencer are the minimum requirements.
For most hunting or pest control applications though, most people would use full-power (high velocity) standard ammunition, as this provides a flatter bullet trajectory as well as a more humane and effective method of dispatch to the target-animal in question.
A suppressor is mainly used to reduce the risk of hearing damage to humans and hunting dogs due to the exposure to gunshot sound pressure waves and also to reduce the alarming of other game animals in the nearby area.
Kaimai® Rifle Suppressors are setting a new standard in lightweight tactical performance by taking advantage of this revolutionary alloy and its extraordinary mechanical properties. We don’t believe the consumer should have to choose between the ‘high-strength’ of a heavy steel product versus the ‘light-weight’ of a fragile aluminium one. Tennalum® 7068 offers both, the strength of steel at the weight of aluminium. Although expensive and difficult to obtain, 7068 gives our products an unparalleled strength-to-weight advantage over the competition. When you purchase a Tennalum® product from Kaimai®, you can be confident you’ve reached the pinnacle of lightweight performance.
So what are you truly purchasing in terms of performance? Below is a comparison of how Tennalum® 7068 stands up next to the lightweight alloys used by the rest of the firearms industry.
First a little background – Aluminium (Al) is the single most abundant atomic metal element found in the earth’s crust. It’s a remarkable metal due to its low material density and superb ability to resist corrosion. Pure aluminium, however, is soft, weak, and ductile making it a poor candidate for any high strength application. Though, when mixed with other elements, an alloyed metal can be created with more favourable mechanical properties. The alloyed metal still retains its low density and corrosion resistance but with substantial increases in both strength and hardness. Today, these alloys are used in almost every modern applications where aluminium is found. There are literally hundreds of different alloys that have been engineered and optimized for specific applications.
6061 alloy is one of the most commonly used aluminium alloy today. It is readily available and inexpensive, making it extremely popular for general purpose use. In fact, when you see a product described as being made from ‘alloy aluminium’ or ‘billet aluminium’, or perhaps ‘aircraft aluminium’, but the name of the alloy is not specified, it is a safe bet that it is made from 6061. Virtually all lightweight firearm parts on the market today (optics rails & rings, bottom metal, bolt knobs, etc.) are machined from extruded 6061 alloy. The title ‘aircraft’ aluminium, however, is somewhat misleading since 6061 is not a super-high-strength alloy by any means. With a mere 40 KSI yield strength, it’s use on aircraft is limited to non-critical, low stress components.
7075 alloy is the most common high strength true ‘aircraft’ aluminium alloy used today. Its typical yield strength (73 KSI in the T6 condition) is comparable to certain steels giving the alloy a remarkably high strength-to-weight ratio. In fact, it’s worth noting that its specific strength is comparable to that of 6Al-4V Grade 5 Titanium. However, 7075 is roughly 3-4 times more expensive than 6061. For this reason, it is not as commonly used in the firearms industry as 6061, except in tactical applications where increased strength is a necessity.
Tennalum 7068 Ultra-Strength Aluminium – The Ultimate Alloy
Circa 2000, the Ordnance industry requested development of an ultra-high strength, lightweight alloy with corrosion resistance equal or better than 7075, and with better cracking resistance/toughness than 7075. In response, Tennalum Inc. (a division of Kaiser Aluminum Corp.) developed an ultra-strength alloy called 7068-T6511 – commonly known as Tennalum® 7068. With a yield strength of 99 KSI (683MPa) it has the highest mechanical strength of all commercially available aluminium alloys (2.5 times stronger than 6061, and 35% stronger than 7075 – an alloy commonly referred to in the NZ guntrade as ‘Duralium’) and exceeds that of many steels. In fact, its’ yield strength is approaching that of pre-hardened (HRC 26-32) 41XX and 400 series stainless steels but at a third of the weight. In strength-to-weight ratio, Tennalum® 7068 out-performs nearly all other engineering alloys in existence (33% better strength-to-weight performance than 7075, and 28% better performance than 6Al-4V Grade 5 Titanium). However, due to its higher cost (5-7 times that of 6061) and limited availability, it has seen very little commercial use. But for many applications there is no better alloy, not even Titanium.
In the NZ firearms industry Tennalum® is exclusive to Kaimai® Rifle Suppressors (©2015).
Kaimai® Custom Rifle Suppressors have been designed in consultation with gunsmiths and firearms experts from NZ, Europe and the USA. We have used advances in engineering design and manufacturing from related industries, to produce a range of rifle suppressors that are not only relatively light weight, but durable and very effective at doing their main task – to reduce gunshot sound signature. Having learned from others mistakes, our intention was to overcome some of the design flaws or shortcomings of common suppressor designs. ( Now manufactured and distributed by D.F. Maisey Gunsmithing, Tauranga. (07)544-2207 )
By incorporating ultra high strength aircraft / weapons grade alloys like 7075-T6, Tennalum® 7068 & Titanium (imported from Europe and the USA), along with high quality stainless steel where required in the critical wear and high-temp areas, we have produced very effective and durable suppressors for sporting rifle use that are about 50-66% of the weight of comparable all-steel or stainless-steel units. Further, Kaimai® -Hybrid™ units are designed to give an estimated 3-5 times of the effective service life compared with some competitors very lightly constructed ‘aluminium-only’ units.
While suppressor weight is a consideration, it should not be the main feature if it comes at a drastic reduction in performance levels, durability, or safety. Making a quality suppressor is a compromise between weight, unit size & length, suppression performance, recoil reduction performance, strength & durability, safe function and accuracy, and ultimately – price.
There is no one perfect suppressor for all applications – the user must determine the product which encompasses the best mix of features to suit their main intended use or application. The reality is that in most cases, ‘lightest’ or ‘cheapest’ does not equal ‘best’. There is plenty of evidence of prematurely-failed suppressor products on the market now to validate this point.
Of further concern is that feather-weight compact centerfire suppressors can heat up very quickly (mirage issues, etc.) and may also fall well short of providing any adequate level of sound suppression at all. The test readings of some centerfire suppressors have been shown to still exhibit dangerously high dB levels in comparison tests. This point must not be overlooked if one of your main reasons for purchasing a suppressor is to help protect the hearing of your dog, or children who may be joining you on your hunt. Assuming that all suppressors work ‘pretty much about the same’ and are made to the same quality and performance standards, is a fallacy. Simply stated – in an un-regulated industry – all suppressors are not created equal.
Kaimai®-Hybrid™ centerfire suppressors are very competitively priced, as well as being very high quality and accuracy-enhancing units. The semi-modular design, makes it possible for us to manufacture small to medium production runs of individual components and then assemble the suppressors to order as required, with the calibre-specific baffle inserts and (proprietary design) threaded internal stainless steel muzzle brake, to meet the customer’s request. As the Kaimai Hybrid centerfire suppressors are so robust and durable (due to the addition of stainless steel in critical areas), they are not designed to be dismantled for maintenance by the end-user. There is basically no need, as there are no ongoing requirements to regularly purchase and replace eroded or shot-out baffles, which can be an issue on some other lighter/cheaper alloy suppressors.
Kaimai® ‘Monocore’, ‘Timberline’, and ‘Varminter’ rimfire model suppressors are able to be dismantled for cleaning by the end-user.
Some of the main features of Kaimai® -Hybrid™ Suppressors
- Improved pressure vessel design – O.D. threaded outer tuber and I.D. threaded inner tube. As internal pressure increases the double-overlapping joins tighten. Exhaustive testing including with magnum calibres without any Loctite on joins, showed no leaking. Unlike some competitors products that can tube-swell and leak at the tube ends, the only reason that Kaimai®™-Hybrid™ Suppressors are sealed on the end-caps is to prevent un-authorised disassembly!
- Self-tightening muzzle brake / containment baffle designs (Designs used under license).
- No need to over-tighten suppressor, finger & thumb pressure is enough. Each shot keeps thread fit slightly tight against thread shoulder on barrel with conventional RH thread. Accuracy enhancing.
- Muzzle brake is directly attached to barrel threads, and this diverts and re-directs about 70%-80% of the gas blast forces. This significantly reduces or eliminates the tendency for tube-stretching that is a design weakness of some competitors brake-less suppressor designs.
- Improved service life over aluminium-only units
- Calibre-specific stainless steel blast cone inserts (on centerfire models) prevent premature baffle wear. (Some competitors alloy-only baffles or core-faces soon wear through the anodising layer, and after that will chew-out relatively quickly with normal use.)
- All internal and external 7000 series aluminium alloy parts are hard-coat anodised, for maximum durability and corrosion resistance.
- Co-polymer (High-Temp.) inserts in the baffle system
- Aid in baffle alignment and tensioning
- Deaden any vibration or metallic ‘ping’ noise common with stainless or high-tensile alloy suppressors when inadvertently knocked against scrub or brushes.
- The vibration dampening abilities also aid in improving accuracy – confirmed by our own testing.
- Exhaustive testing regime to prove the designs
- Warrantied to be free of defects in material or workmanships
- Consumer Guarantees Act rights for the purchaser.
- Limited Lifetime warranty (conditions apply)
- Click here for further details and conditions of warranty.
- Highest quality
- Our goal is to produce an outstanding product, with advanced design and technological advantages, at a reasonable price. This does not necessarily mean ‘cheap’, because there are always extra costs associated with manufacturing a better quality product. There will always be other vendors who have their place in the market based largely on lowered price point.
- Quality, integrity, performance and reliability are our main goals.
- NZ designed, manufactured and tested.
- European inspired technology and design flair
- Attention to detail and perfection throughout the manufacturing process.
Sample footage of a Kaimai® Compact (over barrel) suppressor being used on a .223Rem bolt-action rifle by professional shooters for goat control operations. This is an example of some of the field testing and R&D work that goes into all Kaimai® products to ensure that they work 100% reliably.
A short video showing the difference between shooting with a rifle un-suppressed vs suppressed.
The following videos have been supplied courtesy of Tauranga Gunsmith Dean Maisey ( @ August 2015)
With about 20 years of professional gunsmithing his experience and assistance has been invaluable in the design, prototyping and testing of the Kaimai® range of suppressors. His involvement should give customers an assurance that the highest quality, performance and safety levels have been achieved before these suppressors have been released onto the market.
PART ONE (General Overview of rifle suppressors / silencers – 17mins) @ August 2015
PART THREE (Review and explanation of Kaimai® rimfire monocore suppressor – 10mins)
PART FOUR (Review of Kaimai® BLACKOUT (Subsonic) model on .300 BLK – 6mins)
PART FIVE (Range testing of Kaimai® Ti-TEN AR model on AR15 .223 REM – 11mins)