Hi Guys, Ive been a 'lurker' on the forum for a while but finally joined.
I want to thank the administrators for having this forum in a time where its not politically correct!
Background - as a child of the 70's/80's (Im late 40's) I spent my youth reading every gun publication I could find, and although my interest in different types of firearms is diverse, I've always been drawn to the iconic ones of my generation.
My collection is basically German Sig, Early Glock, Series 70 Colt 1911, Beretta 92s, Walther PPK, HK P7....you get the idea. Whatever was considered sexy in 1985
So moving forward a few years ago I decided to buy an UZI carbine, and register it as a Short-barrel rifle. I chose a Vecter 9mm for this build, and generally am happy with the quality for the price I paid. I stated using a surplus machinegun barrel for the SBR, and kept the carbine barrel full length.
First time a the range I noticed about every 5-6 rounds would not cycle properly using the short barrel. When I put the carbine barrel back on, it would run a little more reliably, but would still occasionally jam. I was using standard 115 gr FMJ brass ammo.
I examined the two barrels, and noticed a considerable difference in the feed ramps of the two barrels. The Vector carbine barrel had a much better (and polished) ramp, whereas the surplus short barrel was a rather crude, steep ramp.
Based on past reliability issues with 1911's I took the short barrel to a gunsmith and had the feedramp polished. Back at the range, had the same issues.
Through trial and error, I quickly discovered it had nothing to do with the feed ramp, and everything to do with the power of the ammunition I was using. Now when I fire any load that has higher pressures (Israeli Hirtenberg (sp?), or 9mm +P loads) it functions flawlessly. I don't think its the magazine springs, as I've tried numerous types of mags and all have the same issue.
So...(long story short) is there something else I can do to improve the reliability of Vector SBR? I have since had the factory carbine barrel cut to SBR length and crowned. I'm guessing that a longer barrel would inherently build more gas pressure and blowback would be more robust, but I really want the short barrels to be able to reliably cycle affordable 'standard' pressure 9mm ammunition.
Maybe something as simple as a recoli spring?
Sorry for the long post, but just wanted to give the whole picture. Again, thanks for the advice and support of this forum.
I want to thank the administrators for having this forum in a time where its not politically correct!
Background - as a child of the 70's/80's (Im late 40's) I spent my youth reading every gun publication I could find, and although my interest in different types of firearms is diverse, I've always been drawn to the iconic ones of my generation.
My collection is basically German Sig, Early Glock, Series 70 Colt 1911, Beretta 92s, Walther PPK, HK P7....you get the idea. Whatever was considered sexy in 1985
So moving forward a few years ago I decided to buy an UZI carbine, and register it as a Short-barrel rifle. I chose a Vecter 9mm for this build, and generally am happy with the quality for the price I paid. I stated using a surplus machinegun barrel for the SBR, and kept the carbine barrel full length.
First time a the range I noticed about every 5-6 rounds would not cycle properly using the short barrel. When I put the carbine barrel back on, it would run a little more reliably, but would still occasionally jam. I was using standard 115 gr FMJ brass ammo.
I examined the two barrels, and noticed a considerable difference in the feed ramps of the two barrels. The Vector carbine barrel had a much better (and polished) ramp, whereas the surplus short barrel was a rather crude, steep ramp.
Based on past reliability issues with 1911's I took the short barrel to a gunsmith and had the feedramp polished. Back at the range, had the same issues.
Through trial and error, I quickly discovered it had nothing to do with the feed ramp, and everything to do with the power of the ammunition I was using. Now when I fire any load that has higher pressures (Israeli Hirtenberg (sp?), or 9mm +P loads) it functions flawlessly. I don't think its the magazine springs, as I've tried numerous types of mags and all have the same issue.
So...(long story short) is there something else I can do to improve the reliability of Vector SBR? I have since had the factory carbine barrel cut to SBR length and crowned. I'm guessing that a longer barrel would inherently build more gas pressure and blowback would be more robust, but I really want the short barrels to be able to reliably cycle affordable 'standard' pressure 9mm ammunition.
Maybe something as simple as a recoli spring?
Sorry for the long post, but just wanted to give the whole picture. Again, thanks for the advice and support of this forum.
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