Diana 34 EMS 1
Diana 34 EMS with synthetic stock.

Part 1
Part 2
Part 3
Part 4

This report covers:

  • 50 yards is difficult
  • The test
  • Target
  • Crosman Premier Heavys
  • Adjust the scope
  • JSB Exact Heavy
  • Adjust scope the second time
  • H&N Baracuda Match 4.50mm
  • Trigger pull
  • Summary

Today I test the Diana 34 Easy Modular System (EMS) for accuracy at 50 yards. The last report was on April 7, so this has been a long time coming.

50 yards is difficult

One of the big reasons this report has taken so long is that 50 yards is difficult for me to schedule. First, it has to be outdoors, because I don’t have that sort of distance inside. I could get it at my church, but I doubt the pastor would want me shooting inside his freshly-painted facility. So outdoors it has to be.

And second, Texas where I live, usually has wind. Wind is a problem when shooting pellets at 50 yards, so sometimes I am all set to go and the weather doesn’t cooperate. But last Friday was perfect, as I have already told you in the report on the HW 30S. As I said at the end of that report, I stopped shooting the 30S and shifted over to the 34 EMS before the wind kicked up, because in Texas it’s not a question of if the wind will blow, but when.

The test

The shooting bench was already set up so all I did was switch rifles and pellets. It took almost no time. I shot the rifle rested directly on the sandbag.

Diana 34 EMS Tom bench
I shot the Diana 34 EMS with the rifle resting directly on the sandbag.

I shot 10-shot groups and the wind cooperated right up to the end of the test. Just after I stopped it started picking up.


I had used a 25-yard slow-fire target for the 30S because of the peep sight. For today’s test I used an NRA 50-foot small bore rifle target whose bulls are a little larger than those on a 10-meter rifle target. There are 11 bulls on the target sheet in 4 rows, with a sighter in the center.

The 34 EMS was scoped with an older  UTG AccuShot 4-16X50AO scope, mounted in BKL 2-piece double-strap one-inch rings. Since the rifle was sighted for 25 yards I started with the scope as it was set, but I knew the pellets would hit lower so I started shooting at a bull on the top row.

Crosman Premier Heavys

The first group was shot with Crosman Premier Heavy pellets. Ten pellets went into 1.691-inches at 50 yards. As I said, they did land below the aim point.

Diana 34 EMS Premier Heavy group
At 50 yards the 34 EMS put 10 Crosman Premiers into 1.691-inches.

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Adjust the scope

Looking at the first group through the spotting scope I estimated the pellets were striking 4 inches below the aim point, but when I measured it today I discovered it was actually 5-1/4-inches. The scope adjusts in 1/8 MOA increments, which is close to one inch at 100 yards, so I adjusted the scope up 64 clicks to raise the impact 4 inches. That’s 8 clicks per inch at 100 yards, or 16 clicks per inch at 50 yards. I also adjusted it 8 clicks to the right as the rifle was shooting about one inch to the left.

JSB Exact Heavy

The second group was shot with the JSB Exact Heavy pellet I was running short of. Ten of them went into 1.348-inches at 50 yards. This group did rise by almost 4 inches but is still 1.35-inches below the aim point.

Diana 34 EMS JSB Heavy group
The 34 EMS put 10 JSB Exact Heavy pellets into 1.348-inches at 50 yards. This was the smallest group of the test.

Adjust scope the second time

So I adjusted the scope again. This time I went up 20 more clicks, which should have been right for the JSB pellets.

H&N Baracuda Match 4.50mm

The last group I shot was with 10 H&N Baracuda Match pellets with 4.50mm heads. They went into a 1.754-inch group that was about 9-tenths of an inch above the aim point. This pellet obviously strikes higher on the target than the JSB that proceeded it.

Diana 34 EMS Baracuda group
The 34 EMS sent 10 H&N Baracuda Match pellets with 4.50 mm heads into a 1.754-inch group at 50 yards.

Trigger pull

As I noted in Part 4, the trigger on this rifle is not crisp. You feel it move through stage 2 of the pull. It isn’t creepy — just not smooth. I never knew when it was going to release, so I had to hold on the target all the way through the pull. This was not difficult because the rifle rested solidly in the sandbag. The 34 EMS does rest securely.


We have certainly looked at the Diana model 34 EMS closely this year. I think Diana launched the rifle incorrectly, but they had a major change of personnel in their marketing department at the time the rifle was launched, so that could explain it.

The modular part of the rifle doesn’t look so modular from the user’s viewpoint. The barrel is supposed to be changeable, but not by the user. The spring is supposed to be interchangeable with the N-Tec gas piston, but the parts for that don’t seem to have materialized. And the front sight that is fiberoptic is supposed to swap out for another sight that is nowhere to be seen. All good things that never materialized this year.

That said, the rifle by itself is still a good value as a spring-piston air rifle. As long as you don’t get one for the wrong reasons, like holding out for the options, you will be getting a quality spring-piston rifle.