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This idea came to me tonight while I was thinking about which Big Bore AR upper to buy.
Here is my idea. I want to take a standard upper receiver and dremel out the ejection port to allow for big bore cases to eject. Then I want to attach a big bore barrel to the upper receiver with a free float barrel nut, hand tight no vice block, no torque wrench, etc. Then I will install a free float hand guard with anti-rotation tabs. Install will now be complete. To switch barrels I will remove handguard, remove barrel nut (hopefully by hand) and install different big bore barrel, handtight only. Then reinstall hand guard. The uppers will be set up for single shot use, no gas tube.
Here is why I think this will be safe. I bought my second AR used and the seller had installed a midwest industries quad rail on it. The barrel nut was the old school type that had to be indexed. The quad rail hand guard threaded on to barrel nut and had a locking ring that tightened up the handguard. After firing the rifle I noticed the barrel would rock ever so slightly inside the hand guard. I thought the hand guard was loose and tried tightening it. It turned out the barrel nut was finger loose but the gas tube kept it from becoming any looser. I fired at least 100 rounds before discovering the problem. I am guessing the barrel was not loose enough to throw off headspace and it wasn't going to come off all those receiver threads. That is why I think a hand tight fit will be safe and the hand guard anti rotation tabs should keep barrel from loosening once hand guard is mounted.
If you think I will blow my face off with this system please explain why, in detail.
Here is my idea. I want to take a standard upper receiver and dremel out the ejection port to allow for big bore cases to eject. Then I want to attach a big bore barrel to the upper receiver with a free float barrel nut, hand tight no vice block, no torque wrench, etc. Then I will install a free float hand guard with anti-rotation tabs. Install will now be complete. To switch barrels I will remove handguard, remove barrel nut (hopefully by hand) and install different big bore barrel, handtight only. Then reinstall hand guard. The uppers will be set up for single shot use, no gas tube.
Here is why I think this will be safe. I bought my second AR used and the seller had installed a midwest industries quad rail on it. The barrel nut was the old school type that had to be indexed. The quad rail hand guard threaded on to barrel nut and had a locking ring that tightened up the handguard. After firing the rifle I noticed the barrel would rock ever so slightly inside the hand guard. I thought the hand guard was loose and tried tightening it. It turned out the barrel nut was finger loose but the gas tube kept it from becoming any looser. I fired at least 100 rounds before discovering the problem. I am guessing the barrel was not loose enough to throw off headspace and it wasn't going to come off all those receiver threads. That is why I think a hand tight fit will be safe and the hand guard anti rotation tabs should keep barrel from loosening once hand guard is mounted.
If you think I will blow my face off with this system please explain why, in detail.