Wednesday, 2 March 2016

How To: Sight Adjustment On The Swiss Arms/GSG P92

I find that my P92 tends to hit two inches down and one and a half inches to the left of where it's aiming when I fire it from five yards, every single bloody time without fail. This is infuriating as the open sights are molded on and therefore non-bloody-adjustable. 

 I like it but it's not a Beretta is it now?

So if I can't adjust the sights, what the buggery can I do? 

Stone the bloody crows - I can move the inner brass smoothbore barrel to line up with the sights, why didn't I think of this before?! Looking down the barrel you can see the inner barrel is off-centre in the recess of the outer barrel, and why it shoots off target.

Should have taken the picture when it was still in the pistol, but the inner brass barrel is definitely pointing down and to the right.

So by removing the inner barrel and packing it out with electrical tape till it pushes it away from the inner wall of the outer barrel, I could get it more central.

I've covered field stripping the P92 before, it's pretty simple really. First drop the magazine,

The mag is dropped as the feed lips on top get in the way of the slide's blowback unit and feed nozzle.

press the button on the right hand side of the frame above the trigger guard,

That's the button.

push the takedown lever 90 degrees downwards on the left side, 

And that's the takedown lever, the whole process can be done very quickly with one hand with a bit of practice (you know, like in the movies when the good guy disarms the bad guy by just pulling the slide off his gun, then cracking him in the nuts with his knee cap).

then the slide simply pulls off forwards.

There it goes, smooth as butter or some vegan alternative.

 Then for easier results you can turn the recoil spring guide 180 degrees (upside down), then push the recoil spring and guide as far forward as you can toward the front of the slide

It does come out easy, just be sure the feed nozzle is out of the way as it can slip forward.

Now you can pull the breech and barrel down and out from the rear.

In bits and all ready to rock and roll.

It's a pretty good idea around this time to check that the blowback unit isn't loose, as they are usually held in with one or two small screws.

The threads on this little screw that holds the blowback unit and bits in place could be finer, but as they're not it can work loose a little after a bit of use. Just check it now and again if the pistol gets a lot of use, or even use a bit of loctite thread glue.

The inner barrel is connected to the outer barrel body with two pins that run though the bottom of the breech, 

The two pins thet hold the inner barrel, they're metal coloured as i've removed them before.

 tap these out from the right with a punch easily enough, 

This one came out by pushing a pin on it

In fact i could pull it out with my fingers at this piont.

and the inner barrel slides out with it's housing. You might find the rear pin a bit stiff to remove but it does go eventually, and the inner and outer barrel bodies are a pretty snug fit so might need a gentle tap as well.

This pin however was a little tighter and needed a little tapping with the head of some pliers.

I had to tap the inner barrel block out , but after one gentle tap with the pliers it came freely by hand.

Also the pins are knurled at one end to hold them in place, so remember to tap them back the right way round when reassembling the pistol.

The shorter rear pin is wider and also tighter, notice the knurling that helps lock them in place at the right side.

The inside of the outer barrel is tapered toward the front, so when it comes to wrapping tape around the inner barrel take this into account - I chose to tape the middle of the barrel so half was left free floating. I might try different places in future to see if accuracy is affected with having more or less of the inner barrel free floating, but for now I want it shooting where it's sighted.

Once there was enough tape around the inner barrel to make a snug fit in the outer barrel, I removed three layers. I added six small layers to the bottom  to push the barrel up, one to the left side and five to the right to centralise it to where I reckon the sights where set to. 

Inner barrel now fitted and sat central on the hole at the end of the outer barrel.

I then reassembled the gun to see if it was shooting straight. I only put the looser fitting pin in the breech just in case I had to do some more adjustment. 

just used the looser pin to test the gun on reassembly.

I decided to remove a layer of tape from the top and add one to the bottom.

Out again and a moved tape about a bit to my satisfaction.

When I reassembled the pistol this time I fitted both pins as I was very happy with the results. Now I can get a nice 'inch at a pinch' grouping using the open sights from seven yards

Inner barrel now sits high and central vertically, shame I got the lens cover off the camera in the picture. Shit happens.

This is the only blowback pistol that this method can be used on to my knowledge, as the Sig X5 and the 1911 both need the inner barrel to move a little when the slide moves back. But then again this is the only pistol (to my knowledge) that is so fucking inaccurate out of the box, however my experience is limited with this type of pistol so it's all a learning curve!

Just a little picture of one of two toy guns I use for speed drawing practice to save wear on the BB pistol's paint job.

Thats it for now.

Best wishes, Wing Commander Sir Nigel Tetlington-Smythe.

P.S. I'm pretty certain this will work with the airsoft version as it's just a bigger caliber, In fact I can't see why KWC don't do a conversion kit to get it shooting 6mm BB's(and visa versa).    


  1. That was awesome my friend, mine is doing the same left-downy, like 7-8 o clock. I will try this, I was sure I could find something about that on the net, I just love this gun. Many thanks for the tutorial!

  2. Cheers mate, it's nice to hear that people have found my random tinkerings of use. I took mine out the other day and at 7 yards they were centering on the bull, out to 10 yards and they tended to centre a tad under an inch lower than the bull. I reckon that'll do me just fine, the very best of luck with your atempt (it is a fairly straight forward mod after all). ATB

  3. So, my first thought was that I could do nothing about it. But I will follow this tutorial some day, just because I live in a big city (Rio) and this gun stays 99% of the time in the closet, would say that 0,9% on my hand just appreciating it (lol) and the rest shooting at the end of the garage space. Perhaps you can make a tutorial about cleaning and lubrication of this gun? I bought for this Tetra Gun Grease, Corrosion X Oil and recently I bought Pellgun Oil for plastic parts and seals, but i'm not sure, or I can be wrong on how to do it. Many thanks!

  4. If you scroll back a year down the blog the is an entries on how to lubricate both this and the Sig Sauer p226x5. Pellgun oil is good for the plastic and rubber parts and adding a drop on the head of the Co2 bulb when you put a fresh one in,It is mostly silicone oil but i prefer to use Abbey silicone oil myself.