Umarex Marlin Old West CO2 BB Revolver Field Test Review
In this Field Test Shooting video for the Umarex Marlin Old West CO2 BB Revolver I check real-world performance: first I measure fps using a fresh standard 12-gram CO2 cartridge and 4.5 mm steel BBs through my chronograph. After that I hang a paper target at 30 feet and fire 10 rounds using the Single-Action-Only trigger to see what kind of grouping the revolver delivers straight out of the box. If you haven’t already seen my Tabletop Video Review for the John Wayne Marshal CO2 BB Revolver, watch that for full specs and close-up footage.
For the velocity test I put five shots through the chronograph. The slowest registered 345 fps and the fastest hit 416 fps, with an average of 403 fps, right in line with Umarex’s claimed 400 fps. Perfect for popping cans and casual plinking out to roughly 30–40 feet. The test was done inside a sea can at about 18°C (≈64°F), which gives a middle-of-the-road CO2 performance; warmer weather will typically push velocities higher.
Next I set the paper target on my pellet trap at 30 feet. Using my usual semi-rested position (hands braced on a front sandbag and seated on a stool), I fired 10 rounds with the Marlin Old West. The group measured roughly 4 inches, a bit left and just slightly high from the bullseye — not far off and similar to the grouping I got with the John Wayne Marshal CO2 BB Revolver, although the Marlin’s velocity numbers were notably higher.
The Umarex Marlin Old West CO2 BB Revolver is an inexpensive, mostly-plastic Single Action Army style revolver. There’s a fair amount of polymer in the construction, but it still feels solid despite being on the lighter side. That lighter weight can make the gun feel a bit twitchy in the hand compared with heavier replicas, which can affect accuracy. At the time of this video the Canadian price was about $99, which makes it good value — especially since it loads 18 rounds quickly compared with traditional shell-loading revolvers, meaning more trigger time with less fuss. There are a number of similar replica revolvers available from our Replica Airguns stores in Canada and the US, so check our stock if you’re shopping around.

