I just put together a pistol configured AR-15 built on a Bushy Lower and a Spikes upper with a 11.5" barrel. The weapon essentially fires as a single shot repeater, i.e., it fires the chambered round, ejects the spent round, resets the hammer, sear and disconnect but fails to pick up the new round out of the magazine. If it resets the trigger and ejects the round, it probably isn't short-stroking so it must be cycling too fast to allow the next round to jump into place. The "Experts" on Arf.com are so full of shit, that I don't know what to believe. They say to bore out the gas port one size to allow more gas but this doesn't make any sense if the weapon is cycling too fast...more gas, faster cycle? The other half of the ARFsperts say to use a longer gas-tube assembly wrapped inside the handguards to reduce the amount of gas to the weapon.The other option seems to be to try a heavier or lighter Buffer and spring, a point that about half the ARFsperts support either one or the other of. I have the same configuration on one of my M16 rifles that functions well with a suppressor but has the same failure when fired without the suppressor, though it always functions with a .22 conversion kit, regardless of suppressed or not. Anyone have this same problem that they have personally resolved?