SaSiFrEd Posted May 1, 2007 Report Share Posted May 1, 2007 Hi, I own a S&W sigma 40 gbb CO2 from KWC. It used to work fine but I believe that because of bad maintenance the blowback stop working. So basically now if I want to shoot it I have cock it manually after every shot. I believe it is an easy and fast fix. Would I just need to replace the recoil spring? What do I need to do? Also, I think this replica is compatible with some glocks. From what I heard I believe its compatible with the G17 or G18, can you help me also with that if you are familiar with the S&W? Thanks in advance Link to post Share on other sites
phoenix360mute Posted May 1, 2007 Report Share Posted May 1, 2007 i doubt you will need to replace the recoil spring, if you can rack it by hand that is. maybe theres a bad vent from the blowback unit from this type of gun (neverowned one) Link to post Share on other sites
SaSiFrEd Posted May 1, 2007 Author Report Share Posted May 1, 2007 Thanks. Any ideas? Assuming that changing the recoil spring won't do a thing, what will? Link to post Share on other sites
Chris North Posted May 1, 2007 Report Share Posted May 1, 2007 It seems to be a common problem with these things, but I haven't seen a fix so far unfortunately. Neither a KWA or a TM recoil spring guide look like they would fit properly, but as phoenix said it really shouldn't be the problem. Check the blowback unit to see if anything is broken. Link to post Share on other sites
mr7q Posted May 2, 2007 Report Share Posted May 2, 2007 When was the last time you lubed it? I had a Marui 1911 that I had just bought do this to me, and after a few shots of silicon spray, it's working like a champ. Link to post Share on other sites
Cons Posted May 2, 2007 Report Share Posted May 2, 2007 it might be the floating vlavle in the blowback unit, on my WA berreta it got shot out the barrel and then on i only got blowback and no gas for the bb. Link to post Share on other sites
Chris North Posted May 2, 2007 Report Share Posted May 2, 2007 I was actually just about to ask about that. What happens when you fire? Does the pistol vent gas, and you need to cock it to stop it? Because that would definitely be the float valve. I don't know fo any replacement parts though. Link to post Share on other sites
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