Avenger bullpup
Air Venturi Avenger Bullpup.

Part 1
Part 2
Part 3
Part 4
Meopta MeoSport R riflescope
Part 5

This report covers:

  • Bipod
  • The test
  • Magazine
  • Second group
  • Discussion

Today I mount a bipod on the Air Venturi Avenger Bullpup and shoot it for accuracy at 25 yards. I will use just a single pellet and try the accuracy with the single shot tray and with the magazine.


I mounted the UTG TBNR bipod. It has a height of 7 to 9 inches and I found that 7 inches was just right. Selling for $230, the TBNR is not an inexpensive accessory. Its legs extend to 5 positions between 7 and 9 inches and they have quick-lock rotating locks to facilitate rapid adjustment. The bipod swivels 360 degrees and also tilts 19 degrees side-to-side. That makes repeatable alignments with the target, such as in leveling, easy.

Avenger Bullpup on bipod
The UTG TBNR bipod on the Avenger Bullpup.

Avenger Bullpup bipod detail
The lever with the arrow in the center of the bipod control the friction on the joint that allows panning (swiveling) and tilting. Panning is a complete circle. Tilting is restricted to 19 degrees. Pushing the lever in the direction of the arrow increases friction.

The test

I shot 10-shot groups at 25 yards and obviously the rifle was mounted on a bipod, which served as the rest. My desire was to shoot 10 shots from the single shot tray and then 10 from the magazine, but as you will read, that plan didn’t work out.

The rifle was already sighted for 25 yards. I figured mounting a bipod would move the point of impact from the last test that was shot off a sandbag, but I figured it would be close enough to work. It was, but therein lies an interesting point that we shall see. Let’s see where the rifle was impacting at 25 yards with the best pellet from Part 5.

I shot JSB Exact King Heavy Mark II pellets, as they have proven the most accurate in the test rifle. 

Avenger JSB group
In the Part 5 test the Avenger Bullpup put 10 JSB Exact King Heavys into 0.299-inches at 25 yards. This was shooting off a sandbag rest.

Avenger first bipod group
Look what happened when I shot off the bipod! The first five or six pellets hit at the top and just above the bullseye and then they walked up and right. This group measures 0.739-inches between centers.

At first I thought the spread out shots were me — not being used to shooting from a bipod. There may be some truth to that, but as I will show in a bit, the rifle settled down after this group. But first we need to talk about the magazine.


The .25-caliber Avenger Bullpup comes with an 8-shot rotary magazine that I haven’t tested until now. I loaded 8 pellets and planned to shoot two more after that to get another 10-shot group. Just one problem — the pellets wouldn’t feed from the magazine! I worked at it for quite some time, but no matter what I did, the bolt refused to go forward and chamber the pellet. The magazine goes in from the right side of the action and there is a definite click when it seats. I tried it that way and I also tried it without the click. Failure to feed both times.

Avenger magazine
As you can see the front of the pellet is damaged. The skirt is similarly damaged. This happened several times before I quit trying.

Okay, if I can’t use the magazine, I will shoot a second group using the single-shot tray. In doing this I learned something valuable.

Second group

The second group, also shot with the single-shot tray, was considerably better. It was also up and to the right of where the first five shots hit in the first group. That tells me that after mounting the bipod the rifle needs time to settle in.

This time 10 shots went into 0.406-inches between centers at 25 yards. It’s a tenth of an inch larger than the group shot off the sandbag with this same pellet, and as I said, part of that could be me. I think it shows what a good bipod can do.

Avenger second group
The second time the Avenger put 10 JSB King Heavys into a 0.406-inch group at 25 yards.

Find a Hawke Scope


I discovered a technique to shooting off this bipod. I hold the left bipod leg as I shoot. That keeps the rifle steady on the bench.

I also discovered that once I corrected the rifle for tilt (leveling the crosshairs), I could rely on it staying that way because the bipod held it firmly. Since I didn’t have to take the rifle off the bipod to reload like I did with the sandbag, the cant remained in one place.

Finally I have to confess that I don’t like bipods. They are fine for snipers who usually don’t have to place their shots in anything smaller than a three-inch circle, but for precision shooting I find them unsuitable. That said there are 35-pound bench rifles that are permanently affixed to mounts that are like bipods, though much stiffer. Those rifles are the ones used to shoot world-record groups.

Because of my bias I may have influenced the outcome of today’s test just a bit. It’s too difficult to tell when it’s yourself, but let’s keep that in mind.