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Kral Puncher Breaker

by Dana Webb

After visiting the 2017 Shot Show in Las Vegas the United States was introduced to the Kral line of rifles and bullpups. The initial reviews were all very exciting, Krals looked to be a great entry level Airgun that offered many features of even the higher end Airguns. The Krals seemed to flood the market almost overnight, several distributors even had them on pre-order. Soon after the first batch of Krals arrived the great reviews started that in turn made them even more desirable to the consumer, the problem with this was nobody really knew much about the guns other than on the surface and short term use. After several weeks some problems with the guns started popping up around various forums. Several well known tuners had made attempts to modify and remedy the problems, parts, design and materials were obviously not well thought out by Kral, leaving many customers to fend for themselves as far as service and repair. This is just a vague story of the initial problems with the guns and needs not go further. Several months ago a gentleman by the name of Roger contracted the Airgun bug and decided to make his first PCP purchase that happen to be a Kral Puncher Breaker bullpup. Over the next three weeks Roger had spent almost every weekend shooting with an elite group of Southern California Airgunners, one of whom was Ron Stephen.

Kral Puncher Breaker

One weekend Roger showed up to shoot, filled his gun, loaded his magazine with pellets and “TINK”, nothing happens and the gun wont fire. Ron, being a good friend ends up taking the rifle home that day in hopes of fixing it through some help and research through the Gateway To Airguns forum . After a bit of reading Ron soon realized just how many problems he was finding and the unfortunate lack of support from not only Kral but the distributors as well. Ron finally called me and had asked what I knew of the Kral line of rifles and if I knew of anyone that had a good amount of experience diagnosing, fixing and tuning them, thankfully I was able to turn him on to a friend of mine Troy Hammer. Troy is fairly new to the forums but has been working with Airguns for a good many years and had a good amount of experience with tuning them. Troy had recently started his full time career as a professional tuner and is the proud owner of Annihilator Airguns. Over the past year Troy has spent a good amount of time with tuning the Kral line of rifles and really is the only one in the United States that will service them as well as offering several custom parts and upgrades. Don’t hesitate to visit his website and reach out for help, he’s more than happy to talk Airguns.


by Ron Stephen

After having a VERY pleasant and educational conversation with Troy on proper disassembly procedure of this rifle, we got together yesterday to tear down the rifle. I wanted to verify, if in fact, it had the same issue with the broken valve stem…
….  and Oh BOYYYYY did we verify it !

My buddies rifle not only had a broken stem, (Yes,… right at the O-ring groove), but it was also BEATEN TO DEATH ! The broken end of the stem was SO Deformed and “Mushroomed”, it was wedged in the valve like a Rivet! Notice in the pic Troy previously shared (of the factory stem), that the stem is chamfered on the very tip. The stem in my buddies rifle was beaten so badly, that the chamfer is completely gone, and is now severely mushroomed.



The broken tip was stuck so tight in the valve body, I could not pull it out. I had to use a drift punch and hammer inside the valve body to drive it out. It was wedged in there MUCH tighter than I would have ever expected. Upon finding it in this bad of condition, I immediately sent these pics to Troy, to ask if this was what he has seen previously on other broken stems,… or if this was the worst he had seen ?  Not to my surprise, he confirmed that this was the worst he had seen so far. In fact, not only was the Stem beaten so badly, but even the Rear Face Surface of the valve body showed significant hammer impact  damage…

Troy and I both feel that there MUST be more to this than simply a “Weak spot” in the stem, due to the O-ring groove. After inspecting the broken pieces, We both feel that there must be a “Bad Batch” of stems, that were Not Properly Heat Treated,… and inevitably made it into the assembly of these rifles from the factory. I tested this theory using a VERY FINE Jewelers Hand File, and I feel our suspicions are spot on. With just a couple of very light strokes of the file on the broken stem’s tip, it was quite evident this was Very VERY SOFT Steel. It basically felt like I was filing on soft butter ! No way could this material EVER stand up to several thousand strikes of a hammer. It is NOT a matter of “IF it will fail”,… it is truly a matter of WHEN it is GOING to Fail !

I want to take this moment to thank Mr. Troy Hammer of Annihilator Airguns and Tuning for his assistance and patience in taking time out of his day, with my several calls for help. I am looking very forward to receiving his improved and upgraded Valve Stems, as well as field testing some of his other products for the Kral rifles.

kral valve stem

(Top) New Annihilator valve stem

It is guys like Troy, who help advance the development and improvement of our sport. He is not just someone who is looking out for himself… He is a active hunter, shooter himself, and he truly wants to help those of us who can benefit from his personal experience with these guns. He is an asset to the sport, and I am glad to have met him. Hopefully we will have an opportunity one day, to share some trigger time and maybe even a hunt or two !  ;D

THANKS Troy !

 

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HUNTING WITH THE .22 SUMATRA CARBINE

The Sam Yang Sumatra 2500 is a powerhouse of an Airrifle in almost any configuration considering it’s ability to generate high muzzle velocity with heavy pellets. The rifle is powerful, but not a real efficient system as it uses a lot of air per shot on high power (it’s better about air use when dialed down) Yes, you can turn this thing down so as to get more shots. The .22 will sling a 43 grain Eun-jin pellet 1000-fps so John had chosen to use some 52 grain custom swaged pellets he had made specifically for this gun. The shot count on low settings is near 50 and on high power near 23 although some tuners such as Will Piatt are getting these to be much more efficient on air consumption.

Johns sumatra 2500

The Sumatra’s total weight with scope was a bit over 10 lbs making it a fairly heavy hunting rifle, especially for hiking around all day. I will say the under-lever design along with the well finished stock really makes the gun look sharp. The magazines are a rotary design, and pellets are loaded from the front (note) they do tend to fall out if you have some loaded in your pocket. This rifle is loud even at the lower power setting, so John contacted  Neil Clague to outfit him with and LDC to quiet the bark down to an appropriate level. With the LDC attached it does increase the overall length of the rifle, but well worth it making the gun nearly silent.

john shooting sumatra 2500

John was able to get very good accuracy with the rifle out to 60 yards being able to continually hit the same target with 1″ groups using his preferred ammo. The Sumatra is a great repeating rifle that’s fairly easy to operate and shoulders nice considering its weight and feels very sturdy and solid. After several days of getting the rifle set up and sighted in we had decided to take it out for some Rabbit hunting in the Mojave desert. John and I set out early that next morning and arrived near 8:30 am to a spot I hadn’t hunted in quite some years, but did offer some good Cottontail populations.

Hunting Mojave

After arriving and filling our guns we set out a ways North where the terrain was quite rocky with low knee high sagebrush that made great habitat for Cottontails and Jackrabbits.

Hunting area in Mojave Desert

It didn’t take long for the both of us to spot a few Jackrabbits, but unfortunately they were at quite a distance away making it difficult to get close enough to present good shots. After walking around for about an hour, spread 50 yards apart, I came around a corner of a rock face and spotted a good size Jackrabbit at near 60 yards that presented me with a good head-shot using my .22 Marauder.

.22 Marauder Jackrabbit kill

After taking a short break I decided to sit up on a rock that overlooked a good portion of our hunting area and too provided me a good view of John’s location.

John hunting in Mojave Desert

I sat for several minutes watching him almost certain he would flush a Cottontail from the nearby rocks and sure enough I heard that distinctive THWACK. John was able to get a great head-shot on a fleeing Cottontail at 30 yards, and it was very exciting to witness from my vantage point.

John's Cottontail kill with Sumatra .22

I soon after made my way down off the rock to congratulate John, and too was able to take some photographs to document his successful kill. Upon inspection of the Cottontail I noticed the large entry and exit holes that made way through the head and out the back of the shoulder, this Sumatra does pack a punch.

Cottontail kill

By this time it was getting later in the day, and we had a good amount of driving ahead to get home so we decided to call it quits. This was just one of many trips I have planned, and can’t wait till the next. Overall I think the Sumatra is an excellent choice for someone looking for versatility, power and accuracy from an Airrifle. I normally am not a fan of Korean guns but after shooting the Sumatra I have to say I was pretty impressed with its function in the field. Anyone looking for an entry level type PCP rifle I think should take a serious look at this rifle and the few unique features it offers. The gun is near ready out of the box but does require a few additions to make it more user friendly such as these enclosed items.