Others Don't Overlook the .25 Caliber Air Venturi MicroStrike

[wahoowad]

What about the Sumo and ring height?

 

[Florida_Man]

What about the Sumo and ring height?

The photo in my first post is with the Sumo, no obstruction. With the geometry of this rifle high or extra high rings are required to comfortably see through your scope. And clearance for the mags. I’m using Monstrum adjustable rings.

Monstrum Adjustable Height,... https://www.amazon.com/dp/B0CB9M4STP?ref=ppx_pop_mob_ap_share

 

[wahoowad]

Thanks for the info. I really appreciate your detailed post and tuning info. I’m confused why your ~24 fpe gun is getting 24 shots while the AEAC video/tune of a .22 gun at 25 fpe was only getting 11. That’s such a big difference especially considering yours is a 25.

The reason I’m focused on this is I prefer a .22 and I’m leaning towards having Utah Airguns perform an initial tune. This means I have to provide them the spec (reg pressure and hammer spring). I know the gun seems simple to adjust but I am limited on air and have a long drive to refill my SCBA tank. I am fine with a 20 to 22 fpe tune as long as I’m getting really good accuracy. Any thoughts on your shot count and what I should tell Utah for that initial tune?

 

[Cantona256]

I purchased the .25 caliber MicroStrike with a very specific purpose. I was not looking for maximum power. I wanted a compact PCP dedicated to 16–25 yard rodent/bird pest control that emphasized accuracy, efficiency, moderate report, and practical shot count.
View attachment 21881


View attachment 21882

View attachment 21883

I own several compact PCPs including a Leshiy Classic, Atomic, Krait, Notos and PP700SA. The MicroStrike was purchased to fill a niche between the PP700SA and the Leshiy Classic.

Preparation​

• Cleaned the barrel with a Ballistol and pull.
• Verified fastener torque.
• Verified the rifle held pressure overnight.
No issues were found.

Factory Configuration​

Regulator: ~2500 PSI
Hammer Spring: ~3 turns from minimum
Pellet: FX 34 gr
Moderator: Factory

The rifle averaged about 30 FPE with approximately 13 regulated shots. Accuracy was promising, but it was louder and used more air than I wanted. (The LabRadar was inadvertently set to 25.4 gr; all energy calculations were corrected to the actual 34 gr pellet.)
View attachment 21884

Tuning Philosophy​

Rather than increase power, I documented every change while lowering regulator pressure. Only one variable was changed at a time and every adjustment was evaluated with chronograph data, 20-shot evaluation targets, and practical shot count.

Progression​

Tune	Approx. FPE	Regulated Shots	Observation
Factory	30	13	Accurate but inefficient
2100 PSI	~27	14	Accuracy improved
1900 PSI / Min HS	24.8	25	Excellent efficiency
1900 PSI / +1/8 HS	24.6	25	Best chrono
1900 PSI / +1/2 HS	23.8	24	Best accuracy

View attachment 21885


View attachment 21886

Current Tune​

Regulator: ~1900 PSI
Hammer Spring: +1/2 turn from minimum
Pellet: FX 34 gr
Scope: Vector Optics Veyron 3–12×
Moderator: DonnyFL Sumo

This tune has produced approximately 24 regulated shots at about 24 FPE. The best tune also produced the best practical accuracy, including a 200/200 score on my 16-yard evaluation target. The slight first-shot point-of-impact shift observed on earlier tunes was greatly reduced with the +1/2-turn hammer spring setting.

Current Impression​

The MicroStrike has exceeded my expectations. The build quality is better than expected, the rifle has responded predictably to tuning, and it has become exactly what I wanted: a compact, quiet, accurate pest-control rifle. I believe many shooters may overlook the .25 because they judge it only by the factory tune. For my application, reducing power and increasing efficiency made it a significantly better rifle.

I'll continue updating this thread as I test the DonnyFL FX moderator, additional pellets, and future .177 and .22 barrel kits.

If you would like any information, please ask!

Edit: 07/05/26

One thing that is a negative on this rifle is the dust cover just spins freely without any tension on it. I am going to see if its an oring I can change that will allow more resistance.

I said that the POI for 16y and 22y is the same, that's not completely true. It is zeroed at 16 yards currently, the distance I shoot most pests. The group is a little under 1/4" low at 22 yards. For minute of squirrel, I can hold the same.

Edit: 07/07/26
Dimensions. I wanted to add to my post the dimensions of the rifle in case anyone is interested.
As it comes from the factory.
Folded Length 17"
Folded Width 4"
Minimum stock adjustment 24 3/8"
Fully extended stock 27 7/8"

My new A3industries PFS-X | 1913 Mount Folding Stock
Folded 17"
Extended 24 3/8"
Width 2 1/4"

This write up is just excellent. Really appreciate the attention to detail and the methodical approach.

24fpe is no joke though. I dropped a 10lb Gray Fox with an Umarex Komplete running just about the same power… to have that in an even more compact form sounds rad.