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Message: <blockquote data-quote="rockchalk06" data-source="post: 3923805" data-attributes="member: 40794">Problem solved. So after talking with [USER=41176]@JEVapa[/USER], people at Tubbs, Aero and Magpul, my problem was my buffer tube.I think I have this terminology correct, but the UBR uses an A5 system. 7 3/4” deep, longer than a Carbine and shorter than a Rifle.Everyone recommend the Tubbs 308AR flat wire spring. Also the H2 Carbine Buffer. Magpul guy said he's running an H3 to slow the dwell time even more, but that's for a later date.I found a Tubbs 308AR spring here locally (last one I think) and an H2 Carbine Buffer.Fingers crossed, loaded 5 mags with one round each of 2500ish FPS 175 BTHP. Gas port fully open, each locked back perfectly. Next, I load 5 rounds in two mags. Fired each mag from bolt lock and it locked back both times and cycled perfect. Lastly I loaded one round, topped the mag at 20 rounds and fired. Runs as it should now.Soft shooter too. Very soft. I did try and tune the gas block some, got down to 3 positions in comfortably, but I'll leave it open for now until my R2 gets here.Thanks again for all the help OSA!</blockquote>