A first look at the NPSS Nitro Piston by Jim House
Posted On Wednesday, 9 December 2009 at 07:27
The Personality of the Nitro Piston
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The Attributes of the Nitro Piston Rifle
The performance of the Nitro Piston
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Benjamin’s first precharged rifle
Posted On at 07:22It started with an idea
Something new
Precharged airguns have so much going for them
Filling is the problem
And so is cost
Crosman could change that!
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Airgun Hunting
Posted On at 07:05Pest Control
Small Game Hunting
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200 meter shooting
Posted On at 06:52REALLY tuning a PCP!
Posted On at 06:24Read more...
Spring gun tuning part 2 : Building a mainspring compressor
Posted On at 06:21This is the most important tool a spring gun tuner owns. It may not be used for every job, but working without one when you need it is like walking a tightrope without a net. I now use a B-Square compressor, but for many years I used a homemade rig that did everything I asked of it. The plans for my compressor came from Tom Gaylord's Beeman R1 book. I've seen simpler compressors, but I've never seen one that was easier to make.
Mainsprings are under tension
To get maximum power from an airgun, the mainspring is usually under tension (compression). In modern spring guns, the trend is toward more compression than in the past. A few rifles such as the TX200 are under almost none - but they are the exception.
You can't contain it!
Never think you can contain the force of a mainspring. Eventually, you'll be able to do so with certain guns you have disassembled many times or even with certain gun models you may have learned very well; but the first time you work on a spring gun, you need to use a compressor.
Simple design
All a compressor does is restrain the rifle while relaxing (or decompressing) the mainspring with control. The task would be simple if all spring guns were built alike - but they aren't. I will address several different methods of gun design in a later posting. For now, just take my word that the compressor has to be very adaptable.
This compressor is built on a 2x8 piece of wood. All the parts attach to a plank.
The headstock, the bridge and the tailstock
The headstock contains the moving ram that compresses the mainspring. You can make a rugged one from a bench vise. There's really nothing to build! The vise is bolted to the plank and used in reverse. The tail of the vise puts tension on the end of the gun holding the mainspring.
The bridge is a tunnel through which the body of the gun passes. It keeps the body of the gun from moving sideways when the mainspring is under tension but not restrained by the gun.
The tailstock is a block of wood with the grain end exposed. The muzzle is pressed against it and the gun cannot move.
The bridge and tailstock are adjustable to accommodate different guns. They can also adjust for a gun that has the barrel on or off.
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Spring gun tuning part 1
Posted On at 06:17Pin punches
Plastic and rubber-headed hammer
A vice
Dowel rods and rubber bands
Lubricants
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Does cocking a breakbarrel gun bend the barrel over time?
Posted On at 06:15The myth goes like this - "If you cock an airgun by its barrel, surely the barrel will bend over time." This is an urban legend and is completely false! But, it illustrates that some shooters are thinking about the strength of the barrel, and that can lead to some dangerous "experiments" that could bend a barrel in an instant.
Airgun barrels are strong!
To prove my point about the strength of airgun barrels, consider this. A Haenel barrel on a breakbarrel model made in the 1930s is still straight today after hundreds of thousands of shots and even some accidents over the years. What about a Diana model 65 target rifle used by a shooting club? Still in service after several MILLION shots by hundreds of club members since the gun was new in 1970, the barrel remains straight enough to win an important match. The mainspring may have been replaced 20 times by now and all the bluing has been worn off the barrel at the front sight where hands have grabbed to cock over the years, but the barrel is still as straight as the day it left the factory. Breakbarrels don't bend with normal usage.
It's EASY to bend a breakbarrel simply by mistreating it!
By deliberately mistreating an airgun, the barrel can be bent in an instant. What some "curious" owners do is break open the barrel, then fire the gun with the barrel broken fully open to see how fast the mainspring can close the barrel. Sounds like great fun, huh?
When the barrel closes with the force of more than 100 lbs. of spring behind it, the end of the barrel where the front sight it mounted wants to continue moving long after the breech slams into its locked position. The result is an upward bend in the barrel at the point where the barrel passes through the breechblock. You can achieve the same effect by running rapidly through a narrow doorway holding a stepladder sideways. The Three Stooges demonstrated that numerous times. Judging from what I see on America's Funniest Home Videos, there are still some idiots dumb enough to try it today!
Shooting with the barrel broken open is DANGEROUS!
A rapidly closing barrel will cut off fingers! People have been hit in the forehead by front sights when the rifle wrenches out of their grasp from closing rapidly. And half the time the stock splinters, in addition to bending the barrel. Stocks cost nearly half the price of the entire gun, so there are several good reasons to NOT TRY this DANGEROUS experiment.
The barrel-bending myth helps sales of sidelevers and underlevers
There is nothing wrong with either a sidelever or an underlever cocking mechanism, as long as you understand that both add weight to the gun. The breakbarrel will always be the most efficient design from a weight standpoint. Some people just will not accept that an airgun barrel can be strong enough to cock a gun millions of times without bending. I wonder how many bottle openers these people wear out in their lifetimes? Or crowbars? Or shovels?
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SAFETY!
Posted On at 06:13Whenever you shoot, safety is your most important consideration, so let's talk about few important aspects of how to be safe with an airgun.
Point that muzzle where you WANT to shoot!
Our No. 1 safety rule is ALWAYS point the muzzle in the direction you want shoot. I did NOT say to point it in a safe direction, because the only safe direction is the one in which a pellet can be fired and do no damage. Follow this rule, and you'll never have to say "I didn't know the gun was loaded" when you shoot something you really didn't want to shoot.
When you think about what would happen if your gun fired at any given moment in time, you'll always handle your gun's muzzle carefully by pointing in the direction you intend to shoot.
Keep your finger off the trigger until you take the shot
This is important with airguns for two reasons. The first one is obvious: if you stay away from the trigger, you won't violate rule No. 1. The second reason is just as important but not as well known: many spring-powered airguns can pinch fingers severely (even cutting them off!) if the barrel closes unexpectedly during loading. To help prevent that, STAY OFF THE TRIGGER until you are ready to shoot.
Wear eye protection when shooting
Always wear safety glasses while shooting. BBs are especially prone to bouncing straight back at you; at close range, lead fragments can also fly back and hit you. Safety glasses are a part of every shooting sport, so get into the habit of wearing them now. Safety glasses should be worn by everyone in the area - not just the shooter.
If you play games with airsoft guns, eye, head and ear protection is more important than any other piece of equipment. Airsoft is a lot safer than paintball, but that's no excuse for ignoring safety altogether.
Use a trap made especially for catching pellets or BBs
Responsible shooting means controlling where the shot goes after its fired. The mistake many people make is not having a good enough pellet trap for the gun they shoot. It takes a lot to stop pellets from a magnum rifle like the Webley Patriot. Wadded-up newspapers and phone books won't do the job. Invest in a trap like the Beeman pellet trap to stop your shots with a margin of safety.
BBs are harder to stop than pellets because they bounce off every hard surface they come in contact with. Crosman's 850 BB trap is ideal for this and is made exactly for this purpose.
There are other safety considerations, of course, so from time to time I will mention a few more. Airgun shooting is one of the safest sports in the world, but that's only because everyone tries hard to keep it that way. Do your part so we can continue to enjoy it!
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