jnsnchzaz Posted January 5, 2015 Share Posted January 5, 2015 I just started building an open gun with a glock 34. I just installed a kkm 9mm barrel with a carver 4 port comp. I am using 15gr Rn extreme bullets with 700x powder. I am having problems with double feeds. I am running an 11lb spring. Any suggestions? jnsnchz Link to comment Share on other sites More sharing options...
peterthefish Posted January 5, 2015 Share Posted January 5, 2015 Double feed as in the empty isn't getting ejected but the slide is still stripping a fresh round from the mag? Link to comment Share on other sites More sharing options...
jnsnchzaz Posted January 5, 2015 Author Share Posted January 5, 2015 When I pull the trigger the first shot fires but the next two get jammed together. Link to comment Share on other sites More sharing options...
kneelingatlas Posted January 5, 2015 Share Posted January 5, 2015 You're not trying to make major with 700x are you? That's a really fast powder and will build pressure fast (not to mention won't work the comp at all). What's your load? Have you chrono'ed yet? Link to comment Share on other sites More sharing options...
jnsnchzaz Posted January 5, 2015 Author Share Posted January 5, 2015 no not major. I was using 4.7 grains with 115gr Rn. I have not chrono'ed yet. This is the load that I was using with my glock before I added the comp. Link to comment Share on other sites More sharing options...
Yagi Posted January 5, 2015 Share Posted January 5, 2015 You need to lower your ejection port in my opinion. Link to comment Share on other sites More sharing options...
kneelingatlas Posted January 5, 2015 Share Posted January 5, 2015 That explains it, adding the comp adds weight to the barrel and holds the slide locked for longer after the bullet exits the barrel, once the slide unlocks there isn't enough energy left to cycle the slide. You either need a lighter recoil spring or hotter ammo. If I were you I would get some more appropriate powder before proceeding, some Autocomp, CFE Pistol, Silhouette or HS6 will do the trick for you. Link to comment Share on other sites More sharing options...
ickus Posted January 5, 2015 Share Posted January 5, 2015 I built a Glock 34 Open that has 11lb spring. kkm with sjc 11port comp and runs great. I agree with Kneeling... but try a 124gr with a major power factor load 1334 fps or higher Link to comment Share on other sites More sharing options...
jnsnchzaz Posted January 6, 2015 Author Share Posted January 6, 2015 That explains it, adding the comp adds weight to the barrel and holds the slide locked for longer after the bullet exits the barrel, once the slide unlocks there isn't enough energy left to cycle the slide. You either need a lighter recoil spring or hotter ammo. If I were you I would get some more appropriate powder before proceeding, some Autocomp, CFE Pistol, Silhouette or HS6 will do the trick for you. Thanks for the input. Link to comment Share on other sites More sharing options...
crotchThrower Posted February 15, 2015 Share Posted February 15, 2015 Ok this may sound strange... During the heavy recoil one of the rounds maybe getting released from the mag, or getting far enough forward and into the chamber to allow for the round beneath it to be picked up. Try to load with the longest oal your mag will allow see if that helps. If not find out if always happens with just this or that mag. Once you feel comfortable these are your problem, grab a hammer and go to town. After buy replacements from Glock. It could the mag lips were too wide. Link to comment Share on other sites More sharing options...
Kraj Posted February 15, 2015 Share Posted February 15, 2015 I had an issue with extracting empties and I replaced the extractor and the spring behind it and had no worries after that Link to comment Share on other sites More sharing options...
bigblock455 Posted February 16, 2015 Share Posted February 16, 2015 11# spring by whom Wolf of SJC? In my experience it matters. I run a 10# Wolf uncaptured in one open G-17 with KKM drop in barrel and Carver 3 port to shoot store bought low power ammo. My other G-17 with KKM barrel and Jäger comp runs a captured IMSI 11# spring both major and minor. The Jäger comped gun shoots flatter both with store bought and with my high power loads. I am going to check function with a 13# spring for major in it also. Link to comment Share on other sites More sharing options...
MrPostman Posted February 22, 2015 Share Posted February 22, 2015 That explains it, adding the comp adds weight to the barrel and holds the slide locked for long after the bullet exits the barrel, once the slide unlocks there isn't enough energy left to cycle the slide. You either need a lighter recoil spring or hotter ammo. If I were you I would get some more appropriate powder before proceeding, some Autocomp, CFE Pistol, Silhouette or HS6 will do the trick for you. Longshot is a good powder for major as well. With the 5.85 inch barrel you are using about 7 grains behind a 124 grain bullet should make for a soft shooting and accurate load. Link to comment Share on other sites More sharing options...
crotchThrower Posted February 22, 2015 Share Posted February 22, 2015 (edited) Fwiw, I use 8.2 grains of longshot behind a 115 jhp and winchester primer. ... It is very loud ... That is my 9mm major load. Only to be used for an open 9mm major pistol. My oal is long compare to what it would fit into a glock mag. So start with 7.8 and go up to 8.2 watching for over pressure signs...am chrono helps too Edited February 22, 2015 by crotchThrower Link to comment Share on other sites More sharing options...
KustomHolsters Posted February 22, 2015 Share Posted February 22, 2015 An 11 pound uncaptured cycles factory with my lone wolf and carver 4 port comp. Link to comment Share on other sites More sharing options...
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