Manu-Arm Air Pistol Disassembly, Part 2

On I go…

The cocking bar, that part of the cocking linkage that pushes the piston back.

I don’t know why it has that square bit. Possibly a sort of anti-beartrap? Hmmm.

One trigger pin pushed out.

The sear is odd, there’s a ball bearing on the sear and one on the piston.

The trigger and its two pins.

I couldn’t remove the “cocking body”.

The pin just wouldn’t come out more than this and I did not want to destroy the gun.

The rear sight.

A setscrew locks the plug to a cross-pin.

I was too lazy to drag out my spring compressor so I just used a bar clamp. The spring does have a significant preload.

Pushing the cross-pin out

The end plug. Notice the integral cruciform spring guide.

The piston.

See the ball? Shiny ball

.

The piston seal is a simple slug of molded elastomer. I forgot to take pics but it has a groove on the underside as it’s molded. I think an easy replacement would be an aluminum slug with an o-ring.

All the parts…

Here’s a poor shot of the two sear balls in contact, representing a cocked condition. When the trigger is pulled the one ball slowly rotates out of contact, which yields a sliding motion as the sear releases. Not crisp, but smooth.

Anyway…reassembly is exactly in reverse. I took some time to properly lube everything. The gun does shoot smoother than before.