The Air Arms S510xs .25 is in fact one of my new favorite Airguns for field use, I love the ruggedness, accuracy and adjustability of it. After spending the rest of the day filming and taking some still photographs we were ready to head back down the mountain. The activity was very slow but still managed a successful trophy Ground Squirrel hunt.

I have truly enjoyed my time spent with this amazing Air Rifle and cringe at the thought of having to return it. I have had my hands on a great many Airguns over the years and can honestly say this may be in one of my top five favorites. I want to thank Pyramydair for sponsoring me to review this rifle and be able to show it’s full potential to making a great hunting gun. My final honest thoughts are as follows:

I spotted quite a few Ground Squirrels sunning themselves on a rock at 116+ yards offering several great shots. I missed on a couple of them only to have continual shots due to the fact they really couldn’t see or hear me from so far away. I made a perfect headshot on one that was sitting in a crack at 116 yards. THWAAAACK!!

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This Ground Squirrel went down with authority sending the THWAAACK echoing through the canyon. The Air Arms works very well for offhand shooting and the adjustable cheek is an added bonus for comfort. The texture on the beautiful walnut stock makes for exceptional grip in a variety of shooting positions. Marley and I spent another hour in this spot and managed to feed some lead to 5 of them. This one I put down at 55 yards with a mean headshot!!

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The standard industry measurement is L10 bearing life. This is the number of hours at a constant speed that a group of bearings will reach before 10% of ...

BobcatS510price

As of October 2019, we use these bushing in our first production run, JBA EZ lube bushings can handle more than 1 pump of grease at 5,000 to 10,000-mile service intervals.

The Air Arms S510xs definitely shoots well and no doubt the regulator and LW barrel are a great combination to the rifle. A 20 shot group like this at 100 yard no doubt puts a smile on my face, can’t wait to get this into the field for some hunting. My initial thought was that 44fpe really isn’t much power for a .25 caliber Airgun here in the United States, this power level however works very well for it. The weather here in CA had been very poor the past several weeks so getting outside was hit or miss with the rain storms.

The morning was a bit cold but nonetheless very beautiful and green after having some much needed rain. I unpacked the rifle and aired up for a full day of field use!

Several weeks ago Pyramydair sent us the new Air Arms S510xs Ultimate Sporter in .25 to be able to field review.  This rifle is one of the hot picks of 2019 so I was very excited to get a chance to field use this awesome rifle. I received the rifle and was very pleased with the packing of it in a very well formed shipping box. The S510xs comes in several stock options, I had chosen the walnut 288cc version in .25 caliber. Air Arms has done a beautiful job with the fit and finish of this sporter, beautiful natural looking wood. The rifle included two 10 shot magazines, T-Bar fill probe as well as some allen wrenches for adjustments to the stock and trigger.

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I had brought several types of pellets but found the .25 JSB Match Diabolo 25.39gr domed pellets worked very well.  Air Arms has done a great job with the ergonomics of the rifle to work very well from the bench. The large 288cc air reservoir gives 32 regulated shots at 44 fpe, a very conservative shot count. The trigger is fully adjustable but was very pleased with it’s set right out of the box, smooth and predictable. After spending some time shooting the rifle and sighting it in I shot several groups at 50 yards, all very good.

The temperature was moving up into the high 60’s with the clouds moving through pretty quickly. Marley and I found a valley that looked to be a good spot to sit in the tall grass and wait for action.

Do not use! Lucas Red n’ Tacky does not work or play too well with our bushings, making them squeak in a short time frame.

The area we would be hunting first was a bit of a hike into some thick forest that had many fallen trees and a hillside with many rocks and logs. By this time it was still cold but the sun was starting to warm us up as we set up behind a large fallen tree.

A few days later we would be hunting the same area but with a bit more wide open terrain that has several rock outcroppings and Oak tree groves. This really is one of the best natural habitats for the California Ground Squirrel.

5-door: 4,193–4,230 mm (165.1–166.5 in); 3-door: 3,860 mm (152.0 in). Width ... 1.998 L (121.9 cu in) (86.0 mm × 86.0 mm) I4, 112 kW (150 hp; 152 PS) at ...

To fill this gun using a standard foster fitting an Air Venturi adaptor will be needed. This model has the 288cc air reservoir that fills to 250 BAR or 3600psi.

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This S510xs .25’s regulator works very well to keep the accuracy very consistent, the gun shoots far better than I can. We moved along to the 100 yard range where unfortunately I would need to contend with some wind. I was actually kind of happy to be able to practice with some wind as the area I would be hunting is frequently very windy. Filming in the wind is never fun and makes it difficult to keep the video smooth and shake free. I shot several groups that fared very well so decided to go for the gold and shoot a 20 shot group. To put it simply, this gun is “ACCURATE”!!!

The Hawke Vantage 3-12X44 SF scope works very well for most hunting situations, the side focus really is a step up from the standard AO model. The glass is clear and the half mil dots really help with those precision shots at longer ranges.

Next we look at the safety that is of a simple crossbolt design, I don’t really like the placement as it’s not able to be put on easily with my index finger.

With the Hawke Sport Optics Vantage Side Focus Rifle Scope you’ll enjoy both close and long-range shooting. The unique 1/2 Mil Dot reticle offers several aim points for those times when you need to hold over or under. All the power you need for your most accurate shooting is built into this scope with its side focus control, low profile MOA turrets, and convenient side focus operation.

We recommend using a grease gun and adding 3-4 pumps of grease in the ball joint and 1 pump in greaseable bushings, every 5,000 to 10,000 miles. If you drive through creaks and in mud pits, we would recommend greasing the ball joint after you are done playing in the mud and water.

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A shroud with vents will expel air and can sometimes be felt by the shooter, this is totally normal to a true shroud design. The Air Arms is fitted with a fully adjustable Cheek piece as well as an accessory rail under the forearm with built in adjustable sling mount. This is a great feature that allows the rifle to be set up comfortably to the individual. I mounted a Benjamin tactical type bipod that extends out to 7.9″ and works well from bench to field.

Compare the gauge on the edge of the package to the width of the deformed Plastigauge to see your bearing clearance! Available in three clerarance ranges: Green ...

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After a full inspection of the rifles function and making sure everything was tight I mounted a Hawke Vantage 3-12X44 SF Scope.

This is a great scope for the money that I believe to be a good step up from the standard AO Vantage. This model has the Side Focus that works much better in the field for quicker adjustments.

Robust, durable and application-specific describe the slewing bearings from Liebherr, turning in a wide range of applications, in all weight and diameter ...

The side lever on this gun is of excellent quality, easily opens and closes with one finger. Really smooth and easy to use, very well done and looked very durable.

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The Air Arms is fully shrouded and one thing to note is it is vented, I mention this because for those not familiar with a vented design.

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Mobilgrease XHP 222 Special grease is designed for a wide range of applications including the industrial, automotive, construction, and marine sectors. Their performance features make them ideal choices for operating conditions including high temperature, water contamination, shock loading, and extended re-lubrication operations. Mobilgrease XHP 222 Special is an extreme pressure grease fortified with 0.75% molybdenum disulfide that provides protection from wear under conditions pivoting and other conditions that lead to loss of oil film.

On the right side of the rifle is the power adjuster knob that has five increments “clicks” for fine tuning the power levels or consuming of air.

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We ended up taking several in the same spot, most were lost down into the many holes that were covering the small embankments. We continued in a big loop that followed a small animal trail that eventually led us down a steep hillside.

Ater mounting the scope I took a look at the T-Bar fill probe, this is Air Arms standard adaptor that I personally don’t like. The reason I don’t like any type of probes or adaptors beyond standard fosters is the get lost easily and are reliant on several O-rings.

It didn’t take long to spot a few Ground Squirrels at 57 yards, this shot needed to get threaded between some branches to make a connect. THWAAACK!!!

Mobilgrease XHP™ 222 Special grease is an extended service lithium complex grease intended for a wide variety of applications and severe operating conditions. These greases were designed to outperform conventional products by applying cutting-edge, proprietary, lithium complex manufacturing technology. It is formulated to provide excellent high-temperature performance with superb adhesion, structural stability, and resistance to water contamination. This grease has a high level of chemical stability and offers excellent protection against rust and corrosion. This grease feature high dropping points and a maximum recommended operating temperature of 140º C (284°F). Mobilgrease XHP 222 Special grease is available in NLGI grades 2 or 3 with an ISO VG 220 base oil viscosity.

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The Ultimate Sporter XS Xtra takes Air Arms’ most prized PCP and adds even more value to a platform already at the height of its powers. With an introduction of a fully-regulated system, the Air Arms S510 XS is the S510 action perfected, with more shots per fill than ever before. This variant features a finely crafted Walnut stock, with luxurious etching that reflects Air Arms dedication to traditional craftsmanship. This XS’s precision checkering on the grip and forend, fine curves and grooved handholds make this PCP a worthy mantlepiece. The Minelli stock comes complete with an adjustable, soft-touch coated cheekpiece, adjustable buttpad, integrated sling mounts, and an accessory rail ready to accept bipods or even a palm shelf. Customers requested a regulated S510 and Air Arms delivered, all while boosting the power of the increasingly popular .25 caliber. With this regulated upgrade, the XS can achieve a whopping 44 ft-lbs in .25, 32 ft-lbs in .22 and 20 ft-lbs in .177. Power isn’t the only thing increasing in the XS. The XS regulator offers increased consistency and shot counts from the 288cc cylinder, delivering an impressive 60 (.177), 55 (.22) and 40 (.25) shots per fill with minimal velocity change.  These long shot strings are further aided by a built-in power adjuster. Each XS Xtra features the prized Lothar Walther barrel, which gives this platform its renowned accuracy. Each rifle includes 2 of Air Arms perfected 10-shot indexing magazines, smooth side-lever cocking mechanism and an easy to read built-in manometer. The Air Arms Ultimate Sporter platform has turned heads at the range since 2013 with shots so accurate they require a double-take. If you want the longest, most consistent shot strings with surgical accuracy, join the elite ranks of Air Arms airgunners with S510 Ultimate Sporter XS Xtra.

The figure below shows the arrangement and meaning and so forth of bearing symbols for miniature and extra-small ball bearings. Classification. Material symbol.

If you go in mud pits or across streams with the vehicle, grease the ball joint after you are done playing in the mud and water.

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I like having the lower power for close range quick shots where a higher magnification can sometimes take awhile to get on target. Excellent scope for the money!! After taking several Ground Squirrels we headed back to the Jeep for some lunch and to film a few details to the video portion of this review. NOTE: Due to weather we had to call the day short and return a few days later

The following week Marley and I headed several hours North to a familiar location where I have spent much time hunting the California Ground Squirrel. This terrain is one of my favorite areas and offers near perfect habitat for these varmints. The weather here has been poor and the temperature and rain has kept many of the ground squirrels inside their holes. We arrived to find some snow still on the ground as well as the temperature being about 44 degrees at 6:00am.

The following day was spent at the 50/100 yard private shooting facility, the weather would hopefully cooperate. I first set up at 50 yards where I spent some time sighting in the new Hawke Vantage scope. The rifle came with two 10 shot rotary magazines that in my opinion are very reliable due to having no “spring” inside. Air Arms has incorporated a mechanism on the rifle itself to advance the magazine. These magazines are very easy to load and very friendly to leave loaded and field carry.

The Air Arms is fully shrouded and is able to be fitted with several different types of moderators to quiet the bark. The end cap is threaded for a 1/2×20 male, I have chosen a DonnyFL Tatsu moderator as these have worked well on my other rifles and are of great build quality.