Sunday, March 16, 2014

Webley / Hatsan Patriot Tear Down

Picking up where I left off.  Removed the stock from the Patriot and set it aside once again.

A few pics of the trigger components from various angles.  (Just in case I need them)

Wish all the pins had retaining clips.

Three pins secure the end cap into the compression tube.  The front two also hold the trigger housing.  Removed the forward-most pin.

Then the middle pin.  With this middle pin out, only the rear pin holds the the mainspring from firing the end cap into the wall.  Or your skull.  Take heed.

There's another pin to remove before the trigger unit will detach from the compression tube. 

This pin is both a pivot for the upper sear as well as a slide for the trigger block safety.

Trigger unit pulls straight down and it's out.

I realigned the pivot hole in the sear and slipped a drift into place to act as a slave pin.

Another view.

I wouldn't consider taking this gun apart without a mainspring compressor.  There are already picture online of injuries sustained from attempting such.    With the gun secured in the compressor, I knocked out the last pin and backed out the end cap.  Expect to need about 4" of travel in the spring compressor.

Some type of glass-reinforced synthetic. 

Sliding safety is reminiscent of the Feinwerkbau 124/127 series.

Under the lever is a plastic detent ball and small spring.

After the end cap, the main spring pulls out.

The spring is huge.  At 14.5 inches, It's--by far--the largest spring I've ever encountered in an air rifle.  The plastic spring guide looks like it's made from the same material as the end cap.

Removed the barrel pivot locking screw next.

And the pivot bolt.  The barrel assembly now just pulls out of the forks and the cocking lever pops out of the piston.

A nice surprise to find shim washers on the breech block.

Like the mainspring, the piston is also massive.

The seal looks burned.  The lip feels hard and not at all pliable. 

I think this was the main culprit in the harsh firing cycle.

Inside the piston body, there was another piece of synthetic that the end of the mainspring seated against.  Seems to have acted as a rotation washer of sorts.

The heaviest walled piston in the world? 

Ordered up a new piston seal from Jim Maccari at Air Rifle Headquarters.  Should have it in another day or two.  The plan is to replace the piston seal and add some buttons to the rear of the piston skirt.  Also considering a longer, tighter fitting spring guide and perhaps a short front guide, too.  We'll see what shakes out.

More soon.

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