A: This depends on personal preference and how you will use the rifle.
For instance, if you plan to walk around in the desert or forest hunting or plinking, the B20 may be a good choice as it is a relatively lightweight rifle.
If, on the other hand, you will be shooting varmints from your porch and the weight of the rifle is not an issue, the added power of the B21(or B22) may fit the bill.

As far as quality, both are very finely built air rifles that are competitive with top European air rifles in terms of accuracy, power, and craftsmanship at a fraction of the cost!

Q: Which is more accurate, a break barrel air rifle or fixed barrel?

A: A fixed barrel airgun theoretically has the ability to be slightly more accurate than a break barrel. This is because on a break barrel design, the barrel position changes ever so slightly from shot to shot. In other words, the barrel on a break barrel rifle is not in the exact place from shot to shot. Break barrel designs are made so well today however that this is really not a factor and unless the shooter is a top marksman, he will never realize any difference in accuracy between a break barrel and fixed barrel design.

Q: Which pellet type is best for my air rifle?

A: The only real way to find this out is to try a variety of pellets through your rifle. Pellettrap.com carries only the highest quality match grade .177 pellets. From our experience, they work best in our rifles.

Q: Which pellet weight should I use?

A: The answer to this question depends a lot on personal preference and whether you want to use your rifle for hunting or plinking purposes. For example, if you are shooting cans from a low power rifle at 30 yards, you would probably have the best luck using a lightweight pellet for accuracy.
If on the other hand, it is windy out, a heavier pellet will hold it's line better. If you are hunting squirrels at close range, a heavier pellet would be preferable.

Q: Which caliber should I buy?

A: This really comes down to personal preference and what the rifle will be used for.
Target shooters and plinkers generally prefer .177. Smaller pellets have relatively higher velocities and thus have a flatter trajectory.
Contrary to popular belief, gravity does not "pull" down a heavier pellet. The lower velocity of the heavier pellet "pulls" down the pellet as it runs out of gas. Larger caliber pellets such as .22 are prefered by many hunters as they strike the intended target or quarry with more force or energy.

Q: Is there a difference between an airgun scope and a firearm scope?

A: Yes. The recoil of spring piston air rifles generates recoil in not only a rearward direction but in a forward direction also. Riflescopes are generally made to handle rearward recoil only. Airgun scopes are made to handle recoil in both directions.
Airgun scopes usually also have a parallax adjustment that provides focus at closer ranges. On CO2 and pnuematic rifles, recoil is generally not a factor in choosing a scope.

MAINTAINING YOUR SPRING-PISTON AIR RIFLE

A spring piston air rifle will remain accurate and trouble free for a very long time if cleaned periodically and lubricated.
Neglecting this will most likely lead to power loss, inaccuracy, and possibly even breakage.
A simple maintenance plan can provide you with years and years of trouble free use of your air rifle however.

Here Are The Maintenance Basics:

The COMPRESSION CHAMBER is that portion of the receiver where actual air compression takes place when the piston moves forward in shooting. The piston seal must remain moist with lubrication to reduce friction, create the best air seal and prevent seal deterioration. Since the air is heated to as high as 2,000 F for a fraction of a second upon firing only high flash point lubricants must be used. This eliminates almost all petroleum based lubes and synthetics used in firearms and pneumatic airguns. They will cause dieseling (detonation) that can possibly damage the gun and injure the shooter. Only specialized synthetic and organic oils carefully selected for high flash point proper lubicity and lack of impurities should be used.

Apply this oil very sparingly. One or two drops every 5,000 to 6,000 rounds, or each 8-12 months, should be plenty. It is best to wait until you can hear the piston seal "squeak" during cocking before you apply Chamber Oil. Do not overlube. Use all lubes sparingly and as directed.

MAINSPRINGS store the energy the shooter provides by cocking the airgun. To expand smoothly with as little friction and vibration as possible, the spring should be lubricated regularly.
The mainspring is housed in the spring cylinder, which is a polished cylinder containing the piston, the mainspring and the spring guide shaft. Velocity and smoothness can be somewhat increased by simple, but careful, treatment. Add 2-3 drops of Spring Oil when the stock is removed. The Spring Oil should be applied to the mainspring of each recoilling spring-piston gun not less than every five or ten tins of pellets or every six months.
Lubrication should be done by an authorized service shop.

COCKING LEVER LINKAGES receive considerable pressure; proper lubrication insures smooth operation and minimum wear.

BARREL PIVOT POINTS and detents benefit from regular lubrication. Remember, do not over-oil and keep low flash point oils away from air vent and breech seal.

BORE CLEANING. Since airguns do not use powder or primers, cleaning is not necessary to prevent most rust. However, it is essential to good accuracy. Use Cleaner/Degreaser. Accuracy suffers badly due to caked grease residue blown into the bore from the compression chamber and from leading. Most accuracy complaints are the result of dirty bores-even though they may look clean! For storage, clean the bore and leave it with a light coating of a good airgun oil. (Do not use regular firearm bore cleaners as they may injure seals and cause dieseling).
Follow with dry patches until no trace of oil is seen. A few regular or cleaning pellets will have to be shot through a cleaned barrel before it can be expected to return to its "zero".

EXTERIOR SURFACES should be regularly wiped with a Silicone Cloth or protectant to maintain the quality of the finish. Before any guns are stored they should be given a good wiping with a very high grade polarizing oil.

USE PROPER PELLETS! Use only high quality pellets such as Xisico match pellets to avoid harmful oils, abrasive material and gun-wrecking air blow-by. Precision adult airguns are intended for use only with lead shot or pellets. Steel shot or darts generally injure rifled bores. Properly seated pellets should not show rubmarks on rear of skirt if breech is reopened prior to firing. Damaged, used, or unauthorized projectiles may be unsafe. Plastic jacketed projectiles may cause dangerous ricochet, excessive piston impact and excessive penetration.