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PostPosted: Thu Sep 09, 2021 2:49 pm 

Joined: Tue Nov 03, 2020 4:43 pm
Posts: 51
Location: Cape Breton
I got this little shooter a while ago and stuck it on the shelf when it began to act up. Had it from new and only a couple hundred bbs through it.

More often than not, it is a single shot gun. Even on a new co2 it's like the gun doesn't have enough juice to rack the slide. But then randomly here and there it will work great for 5 or 6 shots then gummed up again. Tried different holding styles, different ways to act on the trigger, different magazines, took it apart for a clean/lube, summer/winter doesn't matter.

Any idea on the issue? Has lots of power when it shoots

PostPosted: Thu Sep 09, 2021 8:57 pm 
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Joined: Sat Sep 24, 2016 8:24 am
Posts: 108
Location: South shore Montreal
I have a Umarex HPP which is the same internals but with a SIG 229ish look.
Looks like you may experience an incomplete co2 puncture hole. Check an empty cartridge if you have a clean hole. Try to screw it in very tight.
You may want to try a different brand of co2. They are slight manufacturing differences. Some might perform better.

I love mine. Heavy blowback. Accurate enough for IPSC style shooting. High shot count.

«It's not enough that we do our best, sometimes we have to do what's required»
- Winston Churchill

Daisy 953
Umarex HPP
Walther PPK/S
Smith & Wesson M&P 40
Colt Python .357 (polymer)
Walther CP99
Smith & Wesson TRR8
KWC 226-S5

PostPosted: Thu Sep 09, 2021 10:23 pm 
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Joined: Mon Feb 11, 2013 12:46 am
Posts: 5060
sounds like you have a small leak for the blowback feature
your not getting enough pressure to function, or the little tab
that brings it back is worn down and catches occasionally

"A candle loses nothing by lighting another candle"


PostPosted: Thu Sep 09, 2021 11:58 pm 
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Joined: Thu Mar 01, 2018 8:01 pm
Posts: 729
Location: Klowntown BC
i have a similar issue on a 5501 (bought jan 2015)..
but mine is now 100% single action cycle.
a mag-fed SAA if you would.

i had the slide off once to see that's it's a simple part that appears to have broken (dec 2019) due to the awesome hard-feeling blow back...

if i recall correctly it's an easy part replacement, an easy fix, and done already, if i had any gumption.

i enjoyed/missed the first one so much i bought new second one just this past mar/2021 and it is currently locked n loaded for playtime shooting dead soldiers..

i have set the following aside to have repaired,
one day.

5501, mechanical
C40, leaks out the valve
Defender, co2 seal leaks
2240, needs frt sight
150, needs CO2 cap
save our shooters

PostPosted: Sat Sep 11, 2021 1:39 pm 

Joined: Tue Nov 03, 2020 4:43 pm
Posts: 51
Location: Cape Breton
I think the leak idea is the one. This morning I opened it up again and got in a 'fix it or f it' mood. I started to dremmel all the touching metal around the 'carrier' and 'hammer'. Clipped a coil off the spring. Lucas red on the moving parts and put er back together. The tolerances are definately way looser - I can cock the gun by flicking my wrist back now. But it still won't load itself, stuck on single shot mode.

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