Brigg Posted October 25, 2020 Report Share Posted October 25, 2020 i figured i should show this here since its been a while. This is one of my current projects, a gas blowback s&w76. So far its mostly done, but i need to get the has efficiency to be better on auto, and i need to have sling bars tig welded on. Its a fairly even mix of machined and 3d printed parts. I mostly used 3d printing for parts that would be very complicated to machine (like the loading nozzle, the magwell, etc). this way if i wanted to make a second one, it wouldnt be nearly as hard as starting from scratch Link to post Share on other sites
judgeman Posted October 25, 2020 Report Share Posted October 25, 2020 Holy *fruitcage* yes more of this please. Link to post Share on other sites
BigAl Posted October 26, 2020 Report Share Posted October 26, 2020 Perfect for gunning down a load of drug dealers in a swimming pool. Link to post Share on other sites
vietnammarine Posted October 27, 2020 Report Share Posted October 27, 2020 Just saw it earlier yesterday on YT thanks to alert... great job Sir!Sent from my iPhone using Tapatalk Link to post Share on other sites
Brigg Posted October 29, 2020 Author Report Share Posted October 29, 2020 The only real issue im still ttying to iron out is the gas consumption. It is quite a gas hog, and on auto it cant quite get though a full magazine. it'll get like 40 shots before it cant quite reach the sear engagement again, and you can see the clouds of gas billowing out in the video if you fire more then a very short burst. Im not really sure whats causing it, though my suspicion is that the valve delay is a bit too long, and its keeping the valve open even after the loading nozzle is no long aligned with the magazine. Unfortunately without fairly substantial changes to the receiver, or making an entirely new bolt, theres really no way to decrease the delay length further then i have already. Both of those options are pretty time consuming so i havent gotten to try either yet. And thats assuming im correct about the problem. It could well be something i havent considered yet. Link to post Share on other sites
Wingmann Posted October 29, 2020 Report Share Posted October 29, 2020 What about using a stronger spring on the release valve? Link to post Share on other sites
Brigg Posted October 30, 2020 Author Report Share Posted October 30, 2020 Well, the release valve is in the magazine, i kinda dont want to mess with those. Link to post Share on other sites
Skarclaw Posted October 30, 2020 Report Share Posted October 30, 2020 fantastic work - looks super fresh!!! Link to post Share on other sites
Wingmann Posted October 30, 2020 Report Share Posted October 30, 2020 16 hours ago, Brigg said: Well, the release valve is in the magazine, i kinda dont want to mess with those. Yes, I know. If you don't want to fiddle with the ones that work fine, maybe you could find some others, intended for CO2, maybe. Link to post Share on other sites
Brigg Posted November 1, 2020 Author Report Share Posted November 1, 2020 Ive been able to get it a lot more efficient, but, im still working on getting it 'perfect'. In the meantime though, it can clear a short mag no problem now, so heres a video of it looking weird with a normal hicapa mag in it. Link to post Share on other sites
Recommended Posts
Archived
This topic is now archived and is closed to further replies.