Umarex apx ngx mods
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Umarex apx ngx mods
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Topic: Umarex apx ngx mods (Read 574 times))
Loe
Shooter
Posts: 91
yes
Real Name: Loe
Umarex apx ngx mods
«
on:
August 20, 2021, 05:45:29 PM »
Hi guys. Today I received a Chinese pumper.
I searched for mods or breakdowns manuals, but I couldn't find anything.
Is there anny one out there that already modded or took it apart.
With photos ore video.?
I modded my daisy powerline 880.
And it shoots really nice.
Hoping for some improvement tips.
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Netherlands, Groningen
Loe
Shooter
Posts: 91
yes
Real Name: Loe
Re: Umarex apx ngx mods
«
Reply #1 on:
August 22, 2021, 08:07:40 AM »
So ok, no one has info I guess. And could not find anny vids or other useful info online.
I was brave enough to take it apart.
And it's more fiddely and very different then a daisy 880.
It's more like a pcp kinda trigger and valve and hammer like.
So I immediately saw the pellet probe was not long enough to push the pellet far enough to not obstruct the air transfer hole.
I wil make a longer probe from a drill bit.
The o rings on the pump where ok.
But the pumphead is horrible with a large dent in it. So I glued some hot glue in and on the head in order to fill the dead space.
Now it's pumping a lot better.
I polished the hammer and triggersear.
The trigger goes verry heavy because of the heavy hammerspring.
The spring is so heave because it acts as a safety. It presses on the valve poppet.
Only if you cock the rifle it realeses the poppet.
So I'm not sure how mutch pressure is needed for that spring to push the poppet once under pressure.
But I already took of 1 coil to ease the cocking effort.
It's crazy hard.
The straw barrel is kept snug in the front of the rifle. But there was a plastic holder on the barrel to keep it from drooping.
But it is absolutely useless for it was hanging loose, so I took it away.
That's all for now.
I will make a shotstring later and post it
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Netherlands, Groningen
Back_Roads
I Got A 15 Pump BB Gun :) BB Guns Got Much More Complicated :)
GTA Senior Contributor
Posts: 15927
1st Edition Crosman 760 Pump Master
Real Name: James Seiler
Re: Umarex apx ngx mods
«
Reply #2 on:
August 22, 2021, 10:15:40 AM »
It is very similar to the Bear river Sportsman 900, and their Black Ops Jr., there was a thread here where some one had it totally apart with pictures but can not locate it, was a good read on modding it. Here is what I could find here.
https://www.gatewaytoairguns.org/GTA/index.php?topic=135659.0
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Blowpipe Sam
An ignorant doofus with no business being called a
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Luddite and 21st century hunter gatherer
Real Name: (Captain) Carter
Re: Umarex apx ngx mods
«
Reply #3 on:
August 22, 2021, 11:16:58 AM »
Geo Schoonmaker probably knows. I haven’t seen any posts from him in a while.
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Back_Roads
I Got A 15 Pump BB Gun :) BB Guns Got Much More Complicated :)
GTA Senior Contributor
Posts: 15927
1st Edition Crosman 760 Pump Master
Real Name: James Seiler
Re: Umarex apx ngx mods
«
Reply #4 on:
August 22, 2021, 11:46:03 AM »
Quote from: Blowpipe Sam on August 22, 2021, 11:16:58 AM
Geo Schoonmaker probably knows. I haven’t seen any posts from him in a while.
Might be where I saw the pics
https://www.airgununiverse.net/wp/bear-river-sportsman-900-project/
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https://youtu.be/bk_N1l7H2F4?list=PLASJo4rBxMIk6BNY6V_tZahlmptN6qBlk
Loe
Shooter
Posts: 91
yes
Real Name: Loe
Re: Umarex apx ngx mods
«
Reply #5 on:
August 22, 2021, 12:21:23 PM »
Ah. Thanx guys for the links.
It's somewhat different than the black ops and the bear river. But simularitys are there.
I putted it back together today, and I'm pleasedly surprised.
The barrel is a bit large and the pellets go true it to easy. But I'm using my little tool to widen the skirt a bit so it's getting more spin from the rifling....hopefully.
Cocking goes a bit easyer. Firing not so mutch.
But I putted some snug fitting plastic foam over the barrel. And removed the barrelband more to the front,
Now it shoots more accurate and no more crazy flyers.
Im stil using original pellet probe for I took away some plastic and now the probe can slide a bit more forward pushing the pellet behind the blow hole.
Also removed a mini burr inside the barrel.
My pump head is made of plastic no metal parts. But there was a really big dent witch I filled with hot glue.
Now I get way better pump results and speed of course.
I gained more than 20 mps
From 143 mps at 10 strokes to
165mps at 10 strokes.
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Netherlands, Groningen
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Umarex apx ngx mods